Tracking the top 20 new gTLD is actually quite relaxing and predictable..
.xyz is number one since summer, .club and .berlin are also good followers.. now an IDN – xn--ses554g – suddenly arrived on #2 ranking..

The rest does show a nice stability in the ranking, even though globally these 25 gTLD grew from 1 million to 2.4 million domain names in the same time.

from August to January 2015, ranking of the top 20 new gTLD