The statistics suggests that the actual number of tournament has increased for years while the average attendance of players is dropping more or less steadily since 2006. But I think the data base is somewhat tainted, since the data is based only on those information from Lasombra's TWDA. It would be more interesting to also check the data from the VEKN rating system to actually cross-check this information and see if the data and the trend are actually valid. It could be also the case, that only the willingness to report the tournament winning deck has increased.
A geographical distribution is in my opinion very hard to do sensibly at the moment. For most countries there's simple not enough sample data. When the new tournament reporting system (on VEKN.net) is up and running for year or two, we can extract more data and make some reasonable trend analysis.
One observation that I have made while looking at the raw data, is that the number of tournaments with approx. 10 to 12 players and only 2 rounds and a final has actually increased, which would explain why the average player attendance has dropped a bit.