We've just spotted a website that reports on the "Distribution of content management systems among websites that use .gov". The results are overwhelming in favour of Drupal, at 31.6% of all .gov websites (presumably worldwide) as at 28 March 2013.
After Drupal comes Sharepoint, then DotNetNuke, Ektron, Percussion, Joomla, then Wordpress.
However if you look at "Usage of content management systems for [all] websites [that employ content management systems]" then Wordpress dominates at 54.6%, Joomla second at 8.5%, closely followed by Drupal at 7.1%. Both Wordpress and Drupal appear to be trending upwards, with Joomla marginly trending downwards.
These results are broadly in line with what we see and experience: that Drupal is most popular with - and is a great fit for - the mid-high end of town (including government), with Wordpress better suiting the SME space.
At Itomic we're delighted that we specialise in both Drupal and Wordpress!
