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Commercial Buildings and Floorspace Trends—1979 to 2003
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Figure 1 shows the trend in the number of commercial
buildings from EIA's first commercial buildings survey in 1979 to the
current 2003 CBECS and Figure 2 shows the trend in commercial floorspace
for the same period.
With the exception of the 1995 estimate, the CBECS has
shown a steady increase in number of buildings and amount of floorspace.
The apparent drop in 1995 was not statistically significant; for further
discussion, see this
section of the report “Trends
in the Commercial Buildings Sector.”
Beginning in 1995, the definition of commercial building
was changed, which caused a break in the trend. Two building types—indoor
parking garages and commercial buildings on manufacturing
facilities—previously included in the sample were excluded. The magnitude
of the change is shown by plotting two data points for 1992; the upper
data point was the reported estimate for 1992, and the lower point was the
1992 estimate adjusted to match the 1995 building definition. Statistical
detail added to Figures 1 and 2 shows the estimates of buildings and
floorspace and their 95% confidence ranges.
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Figure 1. Total Commercial Buildings, 1979 to 2003
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Figure 2. Total Commercial Floorspace, 1979 to 2003
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Specific questions may be directed to:
Joelle Michaels
joelle.michaels@eia.doe.gov
CBECS
Manager
Phone: (202) 586-8952
FAX: (202) 586-0018
Alan Swenson
alan.swenson@eia.doe.gov
Pnone:
(202) 586-1129
FAX: (202) 586-0018
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URL:
http://www.eia.doe.gov/emeu/cbecs/cbecs2003/compare.html
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