Premiums for auto insurance in Massachusetts decreased by nearly 13 percent between 2007 and 2009 after the state stopped setting auto insurance rates, according to a report by the National Association of Insurance Commissioners.
The average premium for personal auto insurance in Massachusetts, from the end of 2007 to the end of 2009, fell from $1,056 to $923, or 12.7 percent, according to the report. During the same period, the national average premium decreased by 1.4 percent. Massachusetts’ average rate dropped the most in the country.