How much does the average of aut0 insurance for teenagers?

what the avarage cost of auto insurance for an 18 year old let just say a 2001 2001 prsche boxster im unemployed at the molment but not for long i mean i want somthing decent peace of mind in case i get something happens so tell me what u think personel experiance would be nice and i am in houston. thanks, i found a cheap and good car insurance