I got an (rough) estimate of around $450 a year, based on pricing of an RX-8, WRX, and Miata.
I'm 32, no (recent 4 years) accidents, and multi car and home discounts. I pay around $700 a year for my 06 Dodge Megacab, cars are cheap to me!

Though when I was 20 my 01 Celica was $250 or so a month with no accidents.