The start of a bad joke?
The latest post from The Kitchissippi Museum,What Ottawans were being arrested for in 1911 includes a tabulation of The Nativity of Prisoners Arrested During the Year 1911 (in Ottawa). There's a comment that there was a blitz on Chinese persons (arrested) in May and October. That's as many for the year as a whole as the Irish.
1911 was a census year and statistics on nativity of the population of Ottawa overall were compiled, found at https://goo.gl/VMn2m9 in page 372.
Arrest/Pop is arrests per 10,000 population. Overall arrests of those of British origin are at a rate only a quarter that for the population as a whole. The Scots have the highest among the British and the Irish least. So much for stereotypes!