I think the best way to answer that is to understand that the crime rate may not measure what we think it measures. Specifically, I can recall, and I do have it with me, an article in The Delta, a local newspaper in Surrey, that records a Staff Sergeant Garry Beggs stating that prostitution within Newton rose in one fell swoop rose by over 300%, and that it was not an indication that the Mounties were not doing their job. And he's correct: it wasn't. It's because they had shifted and changed their patrol patterns and some of the focus and emphasis they were putting their efforts into.
Given the dropping number crimes that Canadians report, I do not think that the crime rate would be a great measure to use of successful performance.