I play Texas Hold'Em poker reasonably often in a league called the Geek Poker Tour (GPT). I made a video, yay me!
Being geeks, my friends and I also like to keep track of our stats, which we do on www.statsgenie.com. However, there is a real dearth of graphs on that site, so I regularly scrape our data off there, and produce these graphs. Click on a season above, and then choose the graph to view.
Note that statistics are only shown for players who have played 10% or more of all games in the season.