The German government requires Watchtower to publish their own demise. Any changes to congregations has to be published on their website.
Since 2006 321 congregations have been dissolved and merged into others.
They have also sold 135 Kingdom Halls since 2011. There is also a pdf spreadsheet on our website with all the names of the congregations, links to past year's changes on the jw.org website etc : http://www.watchtower.exposed/oktoberfest-watchtowers-demise/