Year	current US$
1996	40000000
1998	418000000
1999	211200000
2000	59800000
2002	370000000
2005	19500000
2006	45000000
2007	340500000
2008	19700000
2009	21500000
2010	300300000
2011	680500000
2013	195000000
2014	513300000
2015	17800000
2016	1047900000