Not all states are created equal when it comes to the cost of insuring a teenage driver. Due to the increased risk, teenagers are very expensive to insure. According to a report from online auto insurance site insuranceQuotes, U.S. families who add a young driver to their existing auto insurance policy will see an average annual premium increase of 79%. However, in the state of New Hampshire adding a teen to an auto insurance policy adds an average 125.4% premium increase. That is the highest...