Year	US Dollars
1990	21890854732.1989
1991	21315915373.2036
1992	21253147013.162
1993	20235678751.6398
1994	21005410720.7415
1995	22114418058.5535
1996	23464378123.7309
1997	25113119621.58509
1998	26866274419.7995
1999	28521219417.4649
2000	29668145112.3273
2001	31392388184.9199
2002	33544929713.7715
2003	36611332328.7754
2004	40711664330.58521
2005	42689292567.45999
2006	46187373229.40179
2007	49269868741.20818
2008	52347902854.06561
2009	54521375748.3416
2010	56747686400.3387
2011	60296571265.64579
2012	63874777738.5481
2013	68147033834.9311
2014	74265300518.07739
2015	78846068628.7216
2016	82931297616.4408
2017	87582719403.89949