Year	current US$
1995	117000000
1996	70000000
1997	131000000
1998	14000000
1999	14000000
2000	9000000
2001	31000000
2002	26000000
2005	439000000
2006	395000000
2007	639000000
2008	794000000
2009	1207000000
2010	1620000000
2011	1836000000
2012	2281000000
2013	4835000000
2014	6115000000
2015	7934000000
2016	7647000000
2017	8093000000
2018	7855000000
2019	10925000000
2020	4172000000