The data needs cleaning (and every small edit or redirect helps), but multiple sources agree on a trend similar to this, from 2011 to 2014 (partial): 943, 778, 489, 250. http://wikipapers.referata.com/wiki/2011 http://wikipapers.referata.com/wiki/2012 http://wikipapers.referata.com/wiki/2013 http://wikipapers.referata.com/wiki/2014
What's going on?
Nemo