While we're cherry-picking our data:
19. Hemenway, David (2006). Private Guns, Public Health. Ann Arbor, Mich: University of Michigan Press. pp. 65. ISBN 0-472-03162-7. "...a careful analysis of the data did not show that guns reduce crime."
Still no evidence that the rate was dropping before the law. But let's even go one step further an assume I'm wrong. The guns did nothing to lower the crime rate. That still means
you're wrong. The guns
also did nothing to increase crime. So all that chart up there proves is that overall, Canadians are nicer people than Americans. Not exactly Pulitzer-prize stuff there.