Year	current US$
1995	6670000000
1996	6350000000
1997	6317000000
1998	8263000000
1999	8337000000
2000	8527000000
2001	7917000000
2002	7617000000
2003	7002000000
2004	8222000000
2005	8282000000
2006	8437000000
2007	9253000000
2008	13440000000
2009	13262000000
2010	14315000000
2011	17329000000
2012	18731000000
2013	19457000000
2014	22390000000
2015	18711000000
2016	20924000000
2017	17173000000
2018	23104000000
2019	25456000000
2020	11776000000