@alanv:
In germany since 01/2007 until 12/2015:
322 congs merged to 161 (language-congs and normal congs)
6 new regular congs
2 new signlanguage-congs
121 new language-congs (!)
Waiting for new numbers 2016, should be a very interesting.
But main part is: they close congs and merge congs, but you don't see it in the statistic, because of new language-congs. But the language-congs build of normal publishers and build of 20 person or so. So the downfall in the numbers is higher then you think. So I think, that's there way to fix the statistic, build more and more language-congs.
Nearby also one cong was merged lately, more to come.