Magnus Manske wrote:
And the graph is found on http://commons.wikimedia.org/wiki/File:Wikimedia_Commons_files_per_decade.pn...
...using date format "19 May 2010" :-)
Fail. See the wikitext. ISO dates are autotranslated. Use http://commons.wikimedia.org/w/index.php?title=File:Wikimedia_Commons_files_... and you will get 2010年5月19日 instead.