Year	current US$
1995	3391000000
1996	4387000000
1997	5419000000
1998	5385000000
1999	3085000000
2000	3894000000
2001	3199000000
2002	2396000000
2003	2261000000
2004	2871000000
2005	4720000000
2006	5764000000
2007	8211000000
2008	10962000000
2009	10898000000
2010	15965000000
2011	20802000000
2012	22039000000
2013	25028000000
2014	25567000000
2015	17357000000
2016	14497000000
2017	19002000000
2018	18266000000
2019	17593000000
2020	5394000000