Triathlon Statistics

Does anyone know of a good source of triathlon participation statistics? I found a decent source for statistics on Running: http://www.runningusa.org/statistics/trends-07.html#trends1

I was wondering if someone knew of a data set similar to this but for Triathlon.

bump — anyone?

In the Kona Expo section of IM World Championship athlete guide ,there is usually some stats regarding the demographic of the AG athletes in Kona.

http://vnews.ironmanlive.com/assets/files/races/worldchampionship/expo/2007/Kona_Expo_WebLink.pdf

It is not updated as of yet with the demographic as previously. At least I can’t find it anyway.

That’s about it for my knowledge on the stats.