Year-over-year changes?

Hi,

My wife and I are shopping around for a used TM 2619 - preferably one made after 2001 (we've been told that was the year the whole body went aluminum).

Does anyone have a list of year-over-year changes that have been made since 2001? The essential TT seems the same, but outside lights, bumper etc. must have evolved a little, no?

Any help would be greatly appreciated.

Hoping to be a TM soon,

Jason