Of course, each time a new set is released, it adds to the format.
Throughout 04-05 the following sets were released:
TRR DX EM
Throughout 05-06 the following sets were released:
DS LM HP
Throughout 06-07 the following sets were released:
DF PK DP
Throughout 07-08 the following sets were released:
SW GE MD
And by the way, you can only give reputation if you're a staff. :/