This isn't really true according to these sources:
2009 - 294 terrorist attacks in the EU and one was Islamist (as deemed by Europol).
2010 - 249, three Islamist
2011 - 174 attacks, none Islamist
2012 - 219 attacks, six "religiously motivated"
2013 - 152 attacks, two "religiously motivated"
Far more often they appear to be by separatist groups.
https://thinkprogress.org/less-than-...-cec7d8ebedf6/
In America, out of 89 attacks deemed as terrorism between 2011 and 2015, 11 were carried out by Muslims (but got 44% of the media coverage)
http://reason.com/archives/2017/03/2...terrorist-atta
Maybe you have some different information; if so, do share.