Year	US Dollars
1990	2295196137.1591
1991	2422734514.17228
1992	2521172244.73408
1993	2560370726.32482
1994	2726639453.95425
1995	2795070239.61311
1996	3010360379.41239
1997	3140862288.71378
1998	3125455264.93372
1999	3251484450.3673
2000	3361488440.75553
2001	4042233805.02676
2002	4138131173.17102
2003	4356229151.73851
2004	4368190028.43145
2005	4413979009.07561
2006	4553576690.50986
2007	5362532293.15872
2008	5711121427.16236
2009	5708665324.77563
2010	5992745273.83422
2011	6103616142.31917
2012	6433811562.92682
2013	6567301760.80856
2014	6696633820.44224
2015	6970527742.2831
2016	7354443195.40087
2017	7832945553.90514