All large cities are concerned about parking space and pollution due to the number of private vehicles. A survey found the information provided below. Which of the predictor causes the maximum change in the 'number of vehicles' (dependent variable) per unit increase?

Predictor	Coefficients
Intercept	100222.6
Gas Price	-689.523
Population of city	0.055
Monthly income of riders	-1.301
Average parking rates per month	152.456

Note: All the predictor (independent) variables have been scaled.