Don't have any numbers, but it started with the lumber embargo
immediately upon Bush's election (so much for Bush being in favor of
"free trade"). Then an overeaction to the two mad cow episodes with a
beef embargo and then the Iraq war. There are some other things. And
you can tell it from his attitude, he just doesn't like Canada. And it
is much to the US's detriment NOT to have Canada as a good ally. Also,
unless a subsequent administration changed it, Americans are going to
need passports to re-enter the USA from Canada and the US is major
hassling Canadians that work in the US....Maybe hate isn't the right
word, but the Bush administration is mishandling Canadian relations.