What is the canonical, authoritative source to find statistics about Wikidata?

On Sun, Feb 21, 2016 at 11:41 AM, Markus Krötzsch <markus@semantic-mediawiki.org> wrote:

Is it possible that you have actually used the flawed statistics from the Wikidata main page regarding the size of the project? 14.5M items in Aug 2015 seems far too low a number. Our RDF exports from mid August already contained more than 18.4M items. It would be nice to get this fixed at some point. There are currently almost 20M items, and the main page still shows only 16.5M.

I see the following counts:

16.5M (current?) - https://www.wikidata.org/wiki/Special:Statistics
19.2M (December 2015) - https://tools.wmflabs.org/wikidata-todo/stats.php

Where do I look for the real number?