2nd derivative of en.wikipedia growth and my predictions (to 3, 3.5 and 4 million in the form of a cumulative gauss)
<a href="//commons.wikimedia.org/wiki/User:HenkvD" title="User:HenkvD">HenkvD</a>
CC BY-SA 2.5
<span class="int-own-work" lang="en">Own work</span>