If your auto insurance premium is less than $927.58 per year, you’re paying less than the national average. And if you’re lucky enough to live in one of the 10 U.S. states highlighted in this slideshow, you’re paying the lowest premiums in the nation.

The National Association of Insurance Commissioners (NAIC) has released its 2011/2012 Auto Insurance Database Report, including calculations for average annual auto insurance premiums for all 50 U.S. states and the District of Columbia. The NAIC Property and Casualty Insurance Committee directed the Casualty Actuarial and Statistical Task Force to develop the report, which is intended to help states assess their insurance markets.

[Read related: The 10 costliest U.S. states for auto insurance]

The report uses written premium and exposure data obtained statistical agents for the years 2008-2012 for the combined voluntary and residual market. NAIC identifies premium and average expenditure, pure premium, loss ratio, claim frequency, and claim severity for each state, as well as auto insurance coverages including bodily injury and property damage liability (including no-fault), uninsured and underinsured motorist coverages, medical payments, collision, and comprehensive.

The full report (download the full NAIC report HERE) contains a database with information about cost factors relative to auto insurance in each state, including traffic conditions, medical costs, crime rates, auto repair costs, economic conditions, and state laws related to auto insurance.

Click through to see the 10 states with the least expensive combined auto premiums for 2012 (the most recent annual data available).

(Joseph Sohm/Shutterstock.com)

10. Indiana

Average combined premium for 2012: $723.08


 Montpelier, Vt. (Erika J. Mitchell/Shutterstock.com)

9. Vermont

Average premium: $721.33

Downtown Raleigh, N.C. (Richard Cavalleri/Shutterstock.com)

8. North Carolina

Average premium: $720.73

(Jiri Flogel/Shutterstock.com)

7. North Dakota

Average premium: $714.75

The Cincinnati, Ohio skyline. (Rudy Balasko/Shutterstock.com)

6. Ohio

Average premium: $713.25

Rapid City, S.D. (Sopotnicki/Shutterstock.com)

5. South Dakota

Average premium: $690.95

Madison, Wis. (Juli Hansen/Shutterstock.com)

4. Wisconsin

Average premium: $666.79

 Portland Lighthouse in Portland, Maine. (Aeypix/Shutterstock.com)

3. Maine

Average premium: $663.63

 Des Moines, Iowa. (Henryk Sadura/Shutterstock.com)

2. Iowa

Average premium: $656.43

Boise, Idaho. (Charles Knowles/Shutterstock.com)

1. Idaho

Average premium: $639.19