Did I receive a good or bad car deal?

I purchased and leased a 2005 Toyota Corolla last january of 08. I'm 24 years old and at the time had no credit history and no co-signer. I was working two jobs atm, and used $2000 as a down payment. The dealership gave me a 72 month term with 18% apr. Yes, i realize the interest rate is outstanding. But keep in mind I was approved without a co signer, and had no credit history whatsoever. Now, about a year later, im thinking about trading the car for something else. Nothing brand new, but maybe an 05 Scion XB. But only if the dealership will give me a better deal interest wise. But was this previous deal worth it?