Since it first came out. Competitively, idk, it depends on what you consider competitive. The first VGS I attended was in 08 so I guess that's when I first started. I was at NY regional and Worlds in Florida in 08, at the Philly regional in 09 though didn't get to play, and at the NJ Regional, Nats, and Worlds this year.
Good luck in Stats class, and make sure you come visit Drake, it's much better than BCC ;)