Year	US Dollars
1990	7021410929.00192
1991	8148067534.69964
1992	8671107640.11349
1993	9430511472.95041
1994	8831542738.76899
1995	10116303850.936
1996	10403700920.9951
1997	11712846476.2326
1998	12586176393.3924
1999	13019016527.3399
2000	13394236799.9168
2001	14258223827.1092
2002	13727475579.3156
2003	15204990336.5428
2004	15835731084.509
2005	17530110373.0256
2006	19746872143.9714
2007	22160570151.003
2008	23982353954.7712
2009	23398868046.5184
2010	25191808986.6647
2011	28287496697.78201
2012	30399169809.32608
2013	33429024287.86209
2014	35583310924.41039
2015	35552385772.74599
2016	37547297440.7156
2017	38933716350.67889