If I recall correctly, around 2006.
I'm looking at some dev files and the oldest i could find is mid 09 stuff. I think there's a chance that it could've been developed around late 08. Take that with a grain of salt however
wait nvm most stuff im looking at is mid 07 so 2006 is most definitely the answer
hope they do something for the 10th anniversary
Oh wow anniversary soon? Any legit info?