Year | US | Brazil | Canada | China | Total proportion the four |
2005 | 74.78 | 13.46 | 7.30 | 4.40 | 99.94 |
2006 | 79.78 | 9.34 | 6.97 | 3.87 | 99.96 |
2007 | 79.91 | 8.82 | 7.34 | 3.29 | 99.45 |
2008 | 73.54 | 15.31 | 8.76 | 2.32 | 99.92 |
2009 | 71.15 | 16.81 | 10.41 | 1.50 | 99.88 |
2010 | 71.39 | 16.44 | 10.74 | 1.39 | 99.95 |
2011 | 62.12 | 17.48 | 11.64 | 1.44 | 92.69 |