I see this at reddit from a german friend:
The german Sub look (inspired by a german forum) for numbers of halls (not congs) in Germany and Austria, they are hard to get.
2012 - 1075 halls (google)
2014 - 1034 halls (jw-website)
2008 - 193 halls (jw-website)
Has anybody some other or different figures?
Or there are some figures out there you know from your country? Maybe we can put some interesting stuff together, I don't know.