The state that America's auto industry calls home is also the state that boasts the nation's highest car insurance rates.

A study recently released by CarInsuranceQuotes.com found that Michigan residents pay the highest rates in the U.S. compared to the average resident income. Eight percent of the average Michigander's income goes to pay car insurance, the study found.

Part of the reason for that status, ABC News says, is that Michigan is the only state that guarantees unlimited personal injury protection, no matter which driver is at fault.

"If you're an accident victim, that will pretty much save you from going bankrupt," said John Egan, the managing editor of CarInsuranceQuotes.com. "But opponents of the system say it jacks up the car insurance premiums for everybody."

Michigan's rates are nearly double that of the second-highest state.

"Michigan is very unique in our auto insurance system," says Lori Conarton, a spokeswoman for the nonprofit Insurance Institute of Michigan tells the website that authored the study. "It's really hard when people compare Michigan premiums to other states because (policyholders in other states) are not paying for the same benefits."

Following Michigan in the Top 5 most expensive states are: 2. Louisiana (5 percent); 3. Kentucky (4.548 percent); 4. West Virginia (4.239 percent); 5. Mississippi (4.045 percent).

The most affordable? Residents of Massachusetts are the big winners, paying only 1.43 percent of their annual income for car insurance. Rounding out the Top 5 most affordable are North Carolina (1.6 percent), Hawaii (1.6 percent), Alaska (1.75 percent) and Oregon (1.95 percent).

Don't see your state among the best or worst? Go here to find a state-by-state breakdown of the CarInsuranceQuotes.com study.