Not to sound negative, but there are SOOOO many factors to premium costs.
State (At-fault, or no-fault)
Age
Deductible
Coverage Requirements (per state)
Discounts (including multiple vehicle, home/multi-plan)
Driving Record (tickets, accidents, ect)
The question itself is basically moot, as it can vary 50% - 200% from one person to the next, based on factors.
DRum