The referenced article doesn't have any figures on crime. A news article from 2017 [1] claims the opposite (refugees commit disproportionately more crime), but adds that just 1 per cent of migrants account for 40 per cent of migrant crimes. [2] has a lot more detailed stats and supports the claim that there are disproportionate increases in crime associated with refugees.

[1] - http://www.telegraph.co.uk/news/2017/04/25/migrant-crime-ger...

[2] - https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2903116