Year: 2007 Billion USD: 8.03 |
Year: 2008 Billion USD: 11.5 |
Year: 2009 Billion USD: 10 |
Year: 2010 Billion USD: 11 |
Year: 2011 Billion USD: 11 |
Year: 2012 Billion USD: 10.05 |
Year: 2013 Billion USD: 11.5 |
Year: 2014 Billion USD: 12.5 |
Year: 2015 Billion USD: 14.5 |