Below is a list from Wikipedia of scifi TV shows filmed in Canada since 2010. That’s just since 2010, and just sci-fi shows. Imagine the list since 2000, for example (also in the same wikipedia page if you’re curious) and expand it to all genres. And think about movies.
The reason I bring this up is that when people complain about jobs going to other countries, it’s always Mexico or an Asian country. I hear this from white Californians, Fox TV (and CNN until Lou Dobbs left) and campaigns from both parties during election season (“Bangalore!” and “Beijing!” featured prominently in Meg Whitman’s campaign, and the Obama campaign is uttering “Mexico!” and “China!” against Romney – it’s nice to see such bipartisanship). I have yet to hear a complaint about film production and acting jobs going to “Hollywood North“, or any other type of jobs (there is a Canadian auto industry, and check out all the hi-tech offices EA, IBM and Microsoft opened there). But I suspect if filming moved down to Mexico (or Bollywood), you’ll start hearing about it.