My first Wikipedia contribution was in January 2004, and you can get a list of my contributions by clicking here:
http://en.wikipedia.org/w/index.php?title=Special:Contributions&target=158.152.12.77 (from IP address without using username)
http://en.wikipedia.org/w/index.php?title=Special:Contributions&target=158-152-12-77 (under username)