Type of Housing Unit and Census Region
	1978	1979	1980	1981	1982	1984	1987	1990	1993	1997	2001	2005
U.S. Total	216.8	214.2	229.2	233.4	229.6	232.6	234.8	245.1	252.5	262.5	274.1	285.3
Mobile Home	13.0	10.4	11.9	10.4	9.6	12.4	12.9	14.0	14.8	15.9	17.6	17.1
Single-Family Detached	149.3	150.8	160.9	166.1	160.3	157.3	156.8	166.7	167.2	178.2	172.6	196.5
Single-Family Attached	9.2	9.2	10.3	8.3	11.3	10.7	13.1	14.4	19.0	23.2	28.4	18.8
Apartments in Buildings with 2 to 4 Units	26.1	22.1	25.2	22.9	24.9	24.8	23.9	22.4	19.4	12.6	21.6	18.8
Apartments in Buildings with 5 or More Units	19.2	21.6	21.0	25.7	23.5	27.4	28.2	27.5	32.2	32.5	34.0	34.1
Total Northeast	49.7	47.6	50.1	51.5	49.6	49.5	49.2	50.8	50.9	49.3	49.3	52.7
Mobile Home	0.7	0.5	1.4	1.3	1.0	1.5	1.7	1.5	1.2	1.0	1.5	0.7
Single-Family Detached	25.8	24.9	28.1	29.5	27.2	28.0	27.0	28.6	27.5	29.2	24.7	30.4
Single-Family Attached	5.0	3.3	5.2	3.7	5.5	4.8	5.2	5.8	6.5	7.4	7.4	6.4
Apartments in Buildings with 2 to 4 Units	10.7	8.9	8.4	9.1	9.0	8.0	7.8	8.2	7.4	3.8	6.9	6.5
Apartments in Buildings with 5 or More Units	7.5	10.1	7.0	7.8	6.8	7.3	7.6	6.7	8.4	8.0	9.0	8.7
Total Midwest	61.4	60.7	60.7	57.9	59.3	56.1	57.0	57.8	59.7	62.6	61.8	63.2
Mobile Home	2.5	1.8	1.3	1.7	1.8	2.7	3.0	4.1	3.7	2.6	3.0	1.7
Single-Family Detached	48.4	48.6	46.6	44.4	43.4	38.6	41.2	42.4	43.3	46.6	41.3	49.1
Single-Family Attached	1.7	1.9	0.8	0.8	1.8	2.1	2.6	1.7	2.1	4.2	7.9	3.4
Apartments in Buildings with 2 to 4 Units	7.4	6.5	8.1	5.6	6.8	7.1	5.7	5.0	4.4	4.0	5.4	3.0
Apartments in Buildings with 5 or More Units	1.4	2.0	3.9	5.3	5.5	5.5	4.5	4.6	6.3	5.2	4.2	5.9
Total South	70.2	68.3	74.9	76.8	77.0	80.6	79.9	84.3	86.8	91.7	98.8	102.7
Mobile Home	8.1	5.9	6.6	5.5	4.8	5.9	5.9	5.7	7.5	8.0	9.2	9.7
Single-Family Detached	50.9	51.6	56.5	58.2	59.7	60.5	57.1	60.8	61.3	64.7	67.9	72.1
Single-Family Attached	1.5	2.7	1.8	1.8	1.2	3.0	3.2	4.2	6.6	6.1	7.1	4.7
Apartments in Buildings with 2 to 4 Units	4.6	3.5	4.6	4.3	5.1	3.8	5.4	5.4	3.7	3.1	5.3	4.3
Apartments in Buildings with 5 or More Units	5.1	4.7	5.5	6.9	6.2	7.5	8.4	8.2	7.7	9.8	9.3	11.9
Total West	35.5	37.6	43.5	47.2	43.7	46.4	48.7	52.1	55.0	58.8	64.2	66.7
Mobile Home	1.7	2.3	2.6	1.8	2.0	2.3	2.3	2.7	2.5	4.4	3.9	5.0
Single-Family Detached	24.2	25.7	29.8	33.9	29.9	30.2	31.5	35.0	35.1	37.7	38.8	44.8
Single-Family Attached	1.1	1.3	2.5	2.0	2.8	0.9	2.1	2.6	3.8	5.5	6.0	4.4
Apartments in Buildings with 2 to 4 Units	3.4	3.3	4.1	3.8	4.0	6.0	5.1	3.9	3.9	1.8	4.0	4.9
Apartments in Buildings with 5 or More Units	5.1	4.8	4.6	5.6	5.0	7.0	7.6	8.0	9.8	9.4	11.5	7.6
Sources: Energy Information Administration, Residential Energy Consumption Surveys, 1978, 1979, 1980, 1981, 1982, 1984, 1987, 1990, 1993, 1997, 2001 and 2005.