Year	current US$
1995	833000000
1996	821000000
1997	869000000
1998	874000000
1999	815000000
2000	931000000
2001	1004000000
2002	928000000
2003	985000000
2004	1085000000
2005	1143000000
2006	1205000000
2007	1192000000
2008	1213000000
2009	919000000
2010	809000000
2011	816000000
2012	787000000
2013	782000000
2014	763000000
2015	666000000
2016	720000000
2017	730000000
2018	592000000