Keep in mind this is just homicide, not assaults, I will look for those stats
http://www.cbc.ca/news/canada/story/2010/04/27/statscan-knifing-report.html
In 2008, 34 per cent of 611 homicides reported by police were committed with knives, a seven per cent increase from 1999 and more than double the approximately 15 per cent level of 1974, the first year for which homicide data is available.
The proportion of homicides involving guns, meanwhile, dropped significantly — from approximately 48 per cent in 1974 to 34 per cent in 2008.