|Via See-ming Lee 李思明 on Flickr|
"Global box office for all films released in each country around the world reached $34.7 billion in 2012, up 6% over 2011’s total, due to an increase in international box office ($23.9 billion) and U.S./Canada box office ($10.8 billion). All international regions with the exception of Europe experienced growth in 2012. Chinese box office ($2.7 billion) grew by 36% in 2012 to become the largest international market, surpassing Japan."
Here's a nice chart via Statista. I also embedded MPAA's infographic on the 2012 results.
You will find more statistics at Statista
2012 Global Box Office Results (source: MPAA)