Year	US Dollars
1990	96681193993.86342
1991	105039693865.24402
1992	113962528467.93999
1993	129045267879.87798
1994	139268175352.61298
1995	146509910165.13998
1996	152853573919.39102
1997	164688873427.15598
1998	159874731598.04498
1999	166519366938.38498
2000	181149147759.427
2001	189092117470.43402
2002	192011820904.16501
2003	205671692148.51694
2004	228727265170.37598
2005	249567673796.05798
2006	280347784548.57104
2007	308920483427.66595
2008	330058727129.51398
2009	315542361071.87811
2010	338089895439.62207
2011	363860139557.70697
2012	372149837839.58282
2013	391614151772.73499
2014	410327280678.53601
2015	423799413721.12701
2016	441342581385.01794
2017	473816005287.57587