Thanks Nemo.
Here's a new version of the highly active editors graph, plus some additional graphs for consideration:
https://commons.wikimedia.org/wiki/File:Very_active_editors,_January-July,_2013,_2014_and_2015.jpg (note that the Commons preview may still show the old version, so download the full size image to see the updated version)
https://commons.wikimedia.org/wiki/File:Very_active_editors,_January-July,_2013,_2014_and_2015,_vertical_base_set_to_zero.jpg
https://commons.wikimedia.org/wiki/File:Active_editors,_January-July,_2013,_2014_and_2015.jpg
https://commons.wikimedia.org/wiki/File:Active_editors,_January-July,_2013,_2014_and_2015,_vertical_base_set_to_zero.jpg
