I have pretty accurate records of all my TG submissions:
11/??/08 - started playing
12/25/08 640,000 (MAME)
1/29/09 758,400 (MAME)
2/21/09 897,400 (MAME)
9/26/09 1,005,800 (Arcade)
2/26/10 1,061,700 (Arcade)
12/27/10 1,068,000 (Arcade)
2/27/11 1,090,400 (Arcade)
5/19/12 1,110,100 (Arcade)
7/25/12 1,127,700 (Arcade)
11/4/12 1,138,600 (Arcade)
After my first year, I dramatically cut down the amount of time I played (burned out, work picked up etc), so this might not be the most accurate progression in terms of timeline.
EDIT: I actually think the new TG has listings of everyone's history of scores (when I click on My Scores it has all my previous submissions, I'm not sure if the date is saved though).