How many years of driving history do insurance companies check?

I was just curious how many years of driving history insurance companies check when looking at new clients.

While it can vary by car insurance company, most insurance companies will charge (rate your premium) for any ticket or violation for 3 years. However, after that 3 years you won't be charged. However, insurance insurance companies will pull 5 years of driving history from your Motor Vehicle Report. Your CLUE report, however, will be show your entire claims loss history.