year: 2005
Total revenue (billion USD): 1.35
year: 2006
Total revenue (billion USD): 2.29
year: 2007
Total revenue (billion USD): 2.51
year: 2008
Total revenue (billion USD): 2.7
year: 2009
Total revenue (billion USD): 3.05
year: 2010
Total revenue (billion USD): 4.3
year: 2011
Total revenue (billion USD): 5.83
year: 2012
Total revenue (billion USD): 7.18
year: 2013
Total revenue (billion USD): 8.99
year: 2014
Total revenue (billion USD): 10.3
year: 2015
Total revenue (billion USD): 15.16