WordPress version 4.5 was released on April 12 2015, minutes after release, the countdown timer ran at immense speeds, we last checked this in August 2015 it reached 43,756,067 and still counting. See it here
In August 2015 BuiltWith.com reported that 51% of all cms websites was build with WordPress, and 40% ot the top 100k used WordPress.
What we love most about WordPress is that it is largely been developed by the community surrounding it.
So many developers and contributors are constantly working around the clock and across the globe to improve every aspect of WordPress.