Year	current US$
1995	488000000
1996	472000000
1997	478000000
1998	487000000
1999	479000000
2000	431000000
2001	351000000
2002	378000000
2003	348000000
2004	426000000
2005	429000000
2006	495000000
2007	569000000
2008	431000000
2009	366000000
2010	442000000
2011	493000000
2012	441000000
2013	439000000
2014	401000000
2015	370000000
2016	440000000
2017	513000000
2018	583000000
2019	601000000
2020	94000000