Year	US Dollars
1990	70376500602.6647
1991	76411846850.95171
1992	77760213918.36681
1993	83053975910.05791
1994	95681358865.6944
1995	104560644618.67599
1996	110849026263.17902
1997	120424390399.23601
1998	122462180346.94701
1999	126134842315.276
2000	131792210147.341
2001	136476174751.51999
2002	145316543237.11697
2003	152816707162.28998
2004	161605233655.22003
2005	175124467294.08099
2006	190233638953.31897
2007	212741406970.05106
2008	238857500699.04404
2009	245058813277.41699
2010	265497471127.17795
2011	287671900500.83801
2012	315303970635.50299
2013	344006517913.92798
2014	359754836073.37988
2015	379802109485.69696
2016	396822607397.974
2017	414693397879.17493