Really intriguing .. I hope you keep this up, I love to see long-ranging statistics like this.
I know that my involvement in Perlmonks varies wildly -- sometimes I'm far too caught up in stuff to visit, sometimes I need a break more often from what I'm doing and need to come visit again. And sometimes I'm chasing down a technical problem and need help.
My guess is that there were a lot of people starting to use Perl, but the user base has solidified and no longer needs to post about the usual questions, as Perlmonks has a good base of knowledge that can be searched. Which leads me to the logical next question, which is, How much is the search function used over the same time period. Are there stats about that?
Alex / talexb / Toronto
"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds