Year	current US$
1995	17000000
1996	35000000
1997	45000000
1998	52000000
1999	48000000
2000	45000000
2001	51000000
2002	64000000
2003	89000000
2004	155000000
2005	278000000
2006	170000000
2007	292000000
2008	431000000
2009	151000000
2010	202000000
2011	263000000
2012	169000000
2013	156000000
2014	154000000
2015	140000000
2016	180000000
2017	188000000
2018	201000000
2019	224000000
2020	67000000