Year	US Dollars
1990	158252970615.98499
1991	168518821857.52301
1992	181504802424.58298
1993	191936046382.92001
1994	210793737672.43103
1995	226545953667.073
1996	234452006977.79401
1997	246367990668.22598
1998	251578178716.13693
1999	244764655702.60602
2000	260328033275.121
2001	269873077334.06302
2002	280243327367.72498
2003	294818829765.237
2004	318889751462.26501
2005	344212389555.14996
2006	378910949412.31213
2007	414795583078.99402
2008	437142244258.93298
2009	449300353459.96094
2010	471218552389.729
2011	508867603845.46594
2012	542354378836.60498
2013	579893168702.47205
2014	618996010273.82605
2015	653965964626.98401
2016	682452749966.74609
2017	695144493663.28003