This number has grown by more than 10% over the years. In 2010, WordPress was known to be used by 51% of the websites, which is still over half.
Apart from that, from January 2021, WordPress usage has grown by 1%—going from 64.1% to 65.2% in a span of seven months.
We can also see that back in 2016, usage had a significant drop, during which Joomla was their biggest competitor with a 3.3% market share.