Year	US Dollars
1990	47439879984.3152
1991	47475247624.26099
1992	49262113819.1703
1993	52896523417.0437
1994	57659313432.6524
1995	61638536694.71459
1996	63786768465.18291
1997	68014584069.6236
1998	70367251139.03081
1999	74200855951.93292
2000	78263633178.5569
2001	82957355031.68259
2002	87388237408.45578
2003	91921198189.30547
2004	96761246143.03751
2005	99289250814.33229
2006	108396286919.83104
2007	115279551134.45401
2008	117980102085.65199
2009	126678281352.85301
2010	129269049408.50499
2011	137009855880.047
2012	139354061387.16898
2013	154323817980.759
2014	161144697479.75003
2015	165867539352.86401
2016	174540453572.63
2017	190519238644.07803