The CFA study showed that:
• Californians have saved $154 billion, or $6 billion a year, since Prop 103 took effect in 1989 compared to what premiums would have been had they followed the national average growth rate.
• Auto insurance liability premiums, excluding comprehensive and collision coverage, went down 7 percent in California since 1989; during the same period, liability premiums went up 58.5 percent nationwide.
• Californians spent just $93.48 more on auto insurance in 2015 than they did in 1989; nationwide drivers spent $352.71 more.
Proposition 103 was passed by California voters on Nov. 8, 1988. Among other provisions, Prop 103 requires that auto insurance rates be based primarily on a driver’s safety record, miles driven and driving experience. It requires all automobile rating factors be approved by the California Department of Insurance and prohibits rating factors like credit score, ZIP code and race.