| Date | Arab Light (US. Dollars Per Barrel) | Brent (US. Dollars Per Barrel) | WTI at Cushing (U.S. Dollars Per Barrel) |
| 1/2/98 | 14.34 | 15.89 | 17.53 |
| 1/5/98 | 13.78 | 15.43 | 16.88 |
| 1/6/98 | 13.70 | 15.35 | 16.88 |
| 1/7/98 | 13.52 | 15.17 | 16.83 |
| 1/8/98 | 13.78 | 15.43 | 16.98 |
| 1/9/98 | 13.78 | 15.29 | 16.63 |
| 1/12/98 | 13.32 | 14.97 | 16.48 |
| 1/13/98 | 13.62 | 15.27 | 16.43 |
| 1/14/98 | 13.26 | 14.91 | 16.45 |
| 1/15/98 | 13.26 | 14.91 | 16.33 |
| 1/16/98 | 13.13 | 14.78 | 16.53 |
| 1/20/98 | 13.45 | 15.10 | 16.43 |
| 1/21/98 | 13.45 | 15.10 | 16.18 |
| 1/22/98 | 12.75 | 14.40 | 15.88 |
| 1/23/98 | 12.82 | 14.47 | 15.63 |
| 1/26/98 | 13.09 | 14.74 | 16.83 |
| 1/27/98 | 13.97 | 15.62 | 16.98 |
| 1/28/98 | 14.02 | 15.67 | 17.33 |
| 1/29/98 | 14.38 | 16.03 | 17.83 |
| 1/30/98 | 13.90 | 15.55 | 17.23 |
| 2/2/98 | 13.90 | 15.55 | 17.05 |
| 2/3/98 | 13.42 | 15.07 | 16.50 |
| 2/4/98 | 12.78 | 14.68 | 16.38 |
| 2/5/98 | 12.80 | 14.70 | 16.58 |
| 2/6/98 | 12.90 | 14.80 | 16.73 |
| 2/9/98 | 12.85 | 14.75 | 16.63 |
| 2/10/98 | 12.67 | 14.57 | 16.43 |
| 2/11/98 | 12.55 | 14.45 | 16.15 |
| 2/12/98 | 12.22 | 14.12 | 15.98 |
| 2/13/98 | 12.17 | 14.07 | 16.03 |
| 2/16/98 | |||
| 2/17/98 | 11.58 | 13.48 | 15.68 |
| 2/18/98 | 11.36 | 13.26 | 16.28 |
| 2/19/98 | 11.98 | 13.88 | 16.18 |
| 2/20/98 | 11.98 | 13.71 | 16.15 |
| 2/23/98 | 12.12 | 14.02 | 15.18 |
| 2/24/98 | 10.60 | 14.02 | 15.18 |
| 2/25/98 | 11.40 | 13.30 | 15.30 |
| 2/26/98 | 11.40 | 13.30 | 15.35 |
| 2/27/98 | 11.40 | 13.30 | 15.43 |
| 3/2/98 | 11.50 | 13.40 | 15.33 |
| 3/3/98 | 11.33 | 13.23 | 15.28 |
| 3/4/98 | 11.12 | 13.17 | 15.33 |
| 3/5/98 | 11.23 | 13.28 | 15.33 |
| 3/6/98 | 10.90 | 12.95 | 14.93 |
| 3/9/98 | 10.49 | 12.54 | 14.33 |
| 3/10/98 | 10.39 | 12.44 | 14.28 |
| 3/11/98 | 10.45 | 12.50 | 14.18 |
| 3/12/98 | 10.08 | 12.13 | 14.20 |
| 3/13/98 | 10.39 | 12.44 | 14.08 |
| 3/16/98 | 10.02 | 12.07 | 13.28 |
| 3/17/98 | 9.04 | 11.09 | 13.23 |
| 3/18/98 | 9.81 | 11.86 | 14.33 |
| 3/19/98 | 9.81 | 11.86 | 14.33 |
| 3/20/98 | 10.24 | 12.29 | 14.33 |
| 3/23/98 | 12.66 | 14.71 | 16.23 |
| 3/24/98 | 12.16 | 14.21 | 15.65 |
| 3/25/98 | 11.96 | 14.01 | 16.33 |
| 3/26/98 | 12.90 | 14.95 | 16.83 |
| 3/27/98 | 12.94 | 14.99 | 16.78 |
| 3/30/98 | 12.61 | 14.66 | 16.23 |
| 3/31/98 | 11.78 | 13.83 | 15.63 |
| 4/1/98 | 11.41 | 13.46 | 15.53 |
| 4/2/98 | 11.33 | 13.38 | 15.73 |
| 4/3/98 | 11.69 | 13.74 | 15.98 |
| 4/6/98 | 11.08 | 13.13 | 15.45 |
| 4/7/98 | 10.66 | 12.71 | 15.23 |
| 4/8/98 | 10.75 | 12.80 | 15.55 |
| 4/9/98 | 11.15 | 13.20 | 15.58 |
| 4/10/98 | 11.15 | 13.20 | 15.58 |
| 4/13/98 | 11.15 | 13.20 | 15.33 |
| 4/14/98 | 11.13 | 13.18 | 15.13 |
| 4/15/98 | 10.88 | 12.93 | 15.48 |
| 4/16/98 | 11.62 | 13.67 | 15.90 |
| 4/17/98 | 11.85 | 13.90 | 15.48 |
| 4/20/98 | 11.69 | 13.74 | 15.43 |
| 4/21/98 | 11.71 | 13.76 | 15.45 |
| 4/22/98 | 11.80 | 13.85 | 14.90 |
| 4/23/98 | 11.45 | 13.50 | 15.18 |
| 4/24/98 | 11.28 | 13.33 | 15.08 |
| 4/27/98 | 11.41 | 13.46 | 15.33 |
| 4/28/98 | 11.87 | 13.92 | 15.73 |
| 4/29/98 | 11.96 | 14.01 | 15.33 |
| 4/30/98 | 11.69 | 13.74 | 15.38 |
| 5/1/98 | 12.27 | 14.32 | 16.13 |
| 5/4/98 | 12.27 | 14.32 | 15.95 |
| 5/5/98 | 12.01 | 14.06 | 15.48 |
| 5/6/98 | 11.88 | 13.93 | 15.38 |
| 5/7/98 | 12.05 | 14.40 | 15.23 |
| 5/8/98 | 11.96 | 14.01 | 15.13 |
| 5/11/98 | 12.19 | 14.24 | 15.18 |
| 5/12/98 | 12.42 | 14.47 | 15.23 |
| 5/13/98 | 12.42 | 14.47 | 14.95 |
| 5/14/98 | 12.00 | 14.05 | 15.08 |
| 5/15/98 | 12.64 | 14.69 | 14.48 |
| 5/18/98 | 12.51 | 14.56 | 14.08 |
| 5/19/98 | 12.64 | 14.69 | 12.98 |
| 5/20/98 | 12.53 | 14.58 | 13.28 |
| 5/21/98 | 12.19 | 14.24 | 14.13 |
| 5/22/98 | 12.37 | 14.42 | 14.63 |
| 5/25/98 | 12.37 | 14.42 | 14.63 |
| 5/26/98 | 12.37 | 14.42 | 14.83 |
| 5/27/98 | 12.58 | 14.63 | 14.98 |
| 5/28/98 | 12.53 | 14.58 | 14.83 |
| 5/29/98 | 12.63 | 14.68 | 15.20 |
| 6/1/98 | 12.03 | 14.08 | 14.98 |
| 6/2/98 | 11.57 | 13.62 | 14.83 |
| 6/3/98 | 11.03 | 13.08 | 14.83 |
| 6/4/98 | 10.68 | 13.08 | 15.13 |
| 6/5/98 | 10.68 | 13.08 | 15.08 |
| 6/8/98 | 11.26 | 13.66 | 14.55 |
| 6/9/98 | 10.69 | 13.09 | 13.85 |
| 6/10/98 | 9.73 | 12.13 | 13.48 |
| 6/11/98 | 9.79 | 12.19 | 12.75 |
| 6/12/98 | 9.27 | 11.67 | 12.58 |
| 6/15/98 | 8.61 | 11.01 | 11.58 |
| 6/16/98 | 8.83 | 11.23 | 11.98 |
| 6/17/98 | 8.92 | 11.32 | 12.60 |
| 6/18/98 | 8.50 | 10.90 | 11.78 |
| 6/19/98 | 8.50 | 10.90 | 11.83 |
| 6/22/98 | 8.81 | 11.21 | 13.43 |
| 6/23/98 | 9.91 | 12.31 | 14.33 |
| 6/24/98 | 9.82 | 12.22 | 14.50 |
| 6/25/98 | 9.56 | 11.96 | 14.03 |
| 6/26/98 | 9.89 | 12.29 | 14.13 |
| 6/29/98 | 9.68 | 12.08 | 14.08 |
| 6/30/98 | 9.64 | 12.04 | 14.18 |
| 7/1/98 | 9.64 | 12.04 | 14.38 |
| 7/2/98 | 9.73 | 12.13 | 14.50 |
| 7/6/98 | 9.07 | 11.82 | 13.93 |
| 7/7/98 | 8.70 | 11.45 | 13.63 |
| 7/8/98 | 8.70 | 11.45 | 13.85 |
| 7/9/98 | 9.33 | 12.08 | 13.88 |
| 7/10/98 | 11.25 | 14.00 | 13.88 |
| 7/13/98 | 8.92 | 11.67 | 13.93 |
| 7/14/98 | 9.10 | 11.85 | 14.58 |
| 7/15/98 | 9.41 | 12.16 | 14.88 |
| 7/16/98 | 9.05 | 11.80 | 14.53 |
| 7/17/98 | 9.68 | 12.43 | 13.98 |
| 7/20/98 | 9.66 | 11.97 | 13.33 |
| 7/21/98 | 9.22 | 11.97 | 13.78 |
| 7/22/98 | 9.17 | 11.92 | 14.08 |
| 7/23/98 | 9.47 | 12.22 | 13.78 |
| 7/24/98 | 9.41 | 12.16 | 13.78 |
| 7/27/98 | 9.71 | 12.46 | 14.23 |
| 7/28/98 | 9.98 | 12.73 | 14.28 |
| 7/29/98 | 9.81 | 12.56 | 14.08 |
| 7/30/98 | 9.90 | 12.65 | 14.23 |
| 7/31/98 | 9.86 | 12.61 | 14.23 |
| 8/3/98 | 9.70 | 12.45 | 13.70 |
| 8/4/98 | 10.06 | 12.11 | 13.75 |
| 8/5/98 | 10.00 | 12.05 | 13.68 |
| 8/6/98 | 10.01 | 12.06 | 13.78 |
| 8/7/98 | 9.98 | 12.03 | 13.80 |
| 8/10/98 | 9.67 | 11.72 | 13.05 |
| 8/11/98 | 9.08 | 11.13 | 12.78 |
| 8/12/98 | 9.21 | 11.26 | 12.73 |
| 8/13/98 | 9.69 | 11.74 | 13.23 |
| 8/14/98 | 9.69 | 11.74 | 13.35 |
| 8/17/98 | 10.07 | 12.12 | 13.20 |
| 8/18/98 | 9.86 | 11.91 | 12.93 |
| 8/19/98 | 10.01 | 12.06 | 13.18 |
| 8/20/98 | 10.20 | 12.25 | 13.53 |
| 8/21/98 | 10.10 | 12.15 | 13.23 |
| 8/24/98 | 10.02 | 12.07 | 13.48 |
| 8/25/98 | 10.33 | 12.38 | 13.58 |
| 8/26/98 | 10.11 | 12.16 | 13.58 |
| 8/27/98 | 9.87 | 11.92 | 13.23 |
| 8/28/98 | 9.99 | 12.04 | 13.50 |
| 8/31/98 | 9.99 | 12.04 | 13.33 |
| 9/1/98 | 9.96 | 12.01 | 13.73 |
| 9/2/98 | 10.03 | 12.08 | 13.68 |
| 9/3/98 | 10.80 | 12.65 | 14.68 |
| 9/4/98 | 11.16 | 13.01 | 14.58 |
| 9/8/98 | 10.78 | 12.47 | 14.28 |
| 9/9/98 | 10.49 | 12.34 | 14.15 |
| 9/10/98 | 10.67 | 12.52 | 14.68 |
| 9/11/98 | 10.97 | 12.82 | 14.33 |
| 9/14/98 | 10.98 | 12.83 | 14.43 |
| 9/15/98 | 10.85 | 12.70 | 14.58 |
| 9/16/98 | 10.87 | 12.72 | 14.53 |
| 9/17/98 | 11.52 | 13.37 | 14.88 |
| 9/18/98 | 11.63 | 13.48 | 15.48 |
| 9/21/98 | 12.40 | 14.25 | 15.48 |
| 9/22/98 | 12.34 | 14.19 | 15.68 |
| 9/23/98 | 12.83 | 14.68 | 15.58 |
| 9/24/98 | 12.64 | 14.49 | 15.83 |
| 9/25/98 | 12.93 | 14.78 | 15.58 |
| 9/28/98 | 12.74 | 14.59 | 15.63 |
| 9/29/98 | 12.48 | 14.33 | 15.98 |
| 9/30/98 | 12.48 | 14.33 | 16.13 |
| 10/1/98 | 12.72 | 14.57 | 15.43 |
| 10/2/98 | 12.30 | 14.15 | 15.63 |
| 10/5/98 | 12.16 | 14.01 | 15.38 |
| 10/6/98 | 12.16 | 14.01 | 15.50 |
| 10/7/98 | 11.97 | 13.82 | 15.08 |
| 10/8/98 | 11.48 | 13.33 | 14.43 |
| 10/9/98 | 11.23 | 13.08 | 14.58 |
| 10/12/98 | 11.17 | 13.02 | 14.43 |
| 10/13/98 | 10.81 | 12.66 | 14.23 |
| 10/14/98 | 10.54 | 12.39 | 14.05 |
| 10/15/98 | 10.54 | 12.39 | 14.05 |
| 10/16/98 | 10.32 | 12.17 | 14.15 |
| 10/19/98 | 9.92 | 11.77 | 13.35 |
| 10/20/98 | 9.53 | 11.38 | 13.43 |
| 10/21/98 | 9.87 | 11.72 | 13.88 |
| 10/22/98 | 9.92 | 11.77 | 13.78 |
| 10/23/98 | 9.96 | 11.81 | 13.85 |
| 10/26/98 | 10.72 | 12.57 | 14.23 |
| 10/27/98 | 10.84 | 12.69 | 14.13 |
| 10/28/98 | 10.53 | 12.38 | 14.28 |
| 10/29/98 | 10.51 | 12.36 | 14.23 |
| 10/30/98 | 10.18 | 12.03 | 14.43 |
| 11/2/98 | 10.54 | 12.39 | 14.38 |
| 11/3/98 | 10.03 | 11.88 | 14.20 |
| 11/4/98 | 9.94 | 11.79 | 14.13 |
| 11/5/98 | 9.94 | 11.79 | 13.98 |
| 11/6/98 | 9.57 | 11.42 | 13.88 |
| 11/9/98 | 9.61 | 11.46 | 13.38 |
| 11/10/98 | 9.32 | 11.17 | 13.53 |
| 11/11/98 | 9.56 | 11.41 | 13.55 |
| 11/12/98 | 9.67 | 11.52 | 13.83 |
| 11/13/98 | 9.67 | 11.52 | 13.58 |
| 11/16/98 | 9.33 | 11.18 | 12.83 |
| 11/17/98 | 8.65 | 10.50 | 12.45 |
| 11/18/98 | 8.45 | 10.30 | 12.13 |
| 11/19/98 | 8.63 | 10.48 | 12.15 |
| 11/20/98 | 8.83 | 10.68 | 12.13 |
| 11/23/98 | 8.58 | 10.43 | 11.83 |
| 11/24/98 | 8.56 | 10.41 | 11.43 |
| 11/25/98 | 8.73 | 10.58 | 11.18 |
| 11/27/98 | 8.68 | 10.53 | 11.18 |
| 11/30/98 | 8.47 | 10.32 | 11.28 |
| 12/1/98 | 7.83 | 9.68 | 11.13 |
| 12/2/98 | 7.79 | 9.64 | 11.23 |
| 12/3/98 | 8.29 | 9.99 | 11.18 |
| 12/4/98 | 8.11 | 9.81 | 11.18 |
| 12/7/98 | 7.43 | 9.33 | 11.48 |
| 12/8/98 | 8.18 | 9.88 | 11.30 |
| 12/9/98 | 8.41 | 10.11 | 11.18 |
| 12/10/98 | 7.47 | 9.17 | 10.73 |
| 12/11/98 | 7.50 | 9.20 | 10.78 |
| 12/14/98 | 7.90 | 9.60 | 11.28 |
| 12/15/98 | 8.04 | 9.74 | 11.55 |
| 12/16/98 | 8.92 | 10.62 | 12.38 |
| 12/17/98 | 8.78 | 10.48 | 11.03 |
| 12/18/98 | 7.85 | 9.55 | 10.95 |
| 12/21/98 | 8.00 | 9.70 | 10.83 |
| 12/22/98 | 8.00 | 9.70 | 10.88 |
| 12/23/98 | 8.00 | 9.70 | 11.08 |
| 12/24/98 | 8.00 | 9.70 | 10.98 |
| 12/28/98 | 8.32 | 10.02 | 11.48 |
| 12/29/98 | 8.63 | 10.33 | 11.73 |
| 12/30/98 | 8.57 | 10.27 | 11.75 |
| 12/31/98 | 8.74 | 10.44 | 12.05 |
| 1/4/99 | 8.74 | 10.44 | 12.33 |
| 1/5/99 | 8.86 | 10.41 | 11.98 |
| 1/6/99 | 8.97 | 10.52 | 12.80 |
| 1/7/99 | 9.88 | 11.43 | 13.08 |
| 1/8/99 | 10.02 | 11.57 | 13.08 |
| 1/11/99 | 10.49 | 12.04 | 13.43 |
| 1/12/99 | 10.22 | 11.77 | 12.88 |
| 1/13/99 | 9.69 | 11.24 | 12.33 |
| 1/14/99 | 9.59 | 11.14 | 12.15 |
| 1/15/99 | 9.40 | 10.95 | 12.13 |
| 1/19/99 | 9.57 | 11.12 | 12.08 |
| 1/20/99 | 9.57 | 10.82 | 11.83 |
| 1/21/99 | 9.37 | 10.92 | 12.38 |
| 1/22/99 | 9.65 | 11.20 | 12.65 |
| 1/25/99 | 9.63 | 11.18 | 12.33 |
| 1/26/99 | 9.26 | 10.81 | 11.98 |
| 1/27/99 | 9.24 | 10.79 | 12.33 |
| 1/28/99 | 9.29 | 10.84 | 12.45 |
| 1/29/99 | 9.49 | 11.04 | 12.75 |
| 2/1/99 | 9.65 | 11.20 | 12.38 |
| 2/2/99 | 8.99 | 10.54 | 12.30 |
| 2/3/99 | 9.16 | 10.71 | 12.38 |
| 2/4/99 | 9.16 | 10.49 | 12.03 |
| 2/5/99 | 8.83 | 10.18 | 11.80 |
| 2/8/99 | 8.53 | 10.08 | 11.68 |
| 2/9/99 | 8.25 | 9.80 | 11.68 |
| 2/10/99 | 8.23 | 9.78 | 11.75 |
| 2/11/99 | 8.27 | 9.82 | 11.85 |
| 2/12/99 | 8.51 | 10.06 | 11.88 |
| 2/16/99 | 8.41 | 9.96 | 11.38 |
| 2/17/99 | 8.33 | 9.88 | 11.53 |
| 2/18/99 | 8.45 | 10.00 | 12.03 |
| 2/19/99 | 8.66 | 10.21 | 11.78 |
| 2/22/99 | 8.55 | 10.10 | 11.98 |
| 2/23/99 | 9.07 | 10.62 | 12.38 |
| 2/24/99 | 8.92 | 10.47 | 12.53 |
| 2/25/99 | 9.11 | 10.66 | 12.58 |
| 2/26/99 | 9.18 | 10.73 | 12.28 |
| 3/1/99 | 8.99 | 10.54 | 12.23 |
| 3/2/99 | 8.75 | 10.30 | 12.53 |
| 3/3/99 | 9.23 | 10.78 | 12.93 |
| 3/4/99 | 9.40 | 10.95 | 13.35 |
| 3/5/99 | 9.55 | 11.10 | 13.30 |
| 3/8/99 | 9.73 | 11.28 | 13.63 |
| 3/9/99 | 9.73 |