Table 8 - Page 1

SAN DIEGO ENERGY USE: TRANSPORTATION SECTOR
Sector Characteristics
1980 1989 1991 1996 2003 2010
SanDiego County Population 1,873,300 2,432,800 2,574,376 2,845,987 3,237,400 3,609,442
County Gross Domestic Products (Billion '89 $) 37.8 55.9 55.5 ------------ ------------ ------------
County Real Personal Income (Million '89 $) 32,720.1 45,868.0 48,577.9 56,958.3 72,119.5 90,488.5
County Vehicle Registrations 1,318,367 1,801,324 1,831,980 2,145,625 2,730,452 3,478,562
Sources:
- Population and Personal Income from SDG&E filing for ER-92.
- Vehicle Registrations for 1980 -1992 from Caltrans.
Office of Traffic Improvement, State of California Department of Transportation, August 10, 1993.
 - Vehicle Registrations for 1996 - 2010 were predicted using a regression model. personal income for 1980 -1992 as the independent (predictor) variables, and paid vehicle registrations for 1980 -1992, as the dependent (predicted) variable. Confidence in the predicted figures is high, since the model yielded an R-Square = 0.984, and a Standard Error of Estimate = 28,878, meaning +/- 1.35% error in the predicted value of the 1996 paid vehicle registrations, 1.06% error for 2003, and 0.8% error for 2010.

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