Year	US Dollars
1990	4061479677.89528
1991	4086743257.55445
1992	4428489002.88116
1993	4155097430.27215
1994	2116345866.44432
1995	2949438155.98659
1996	3337866963.68259
1997	3869796046.95102
1998	4255016948.90313
1999	4520934968.5253
2000	4999341064.6512
2001	5521337733.9383
2002	6359766271.83454
2003	6597036378.73307
2004	7285996230.83971
2005	8270269177.20792
2006	9322357767.823
2007	10351916764.0799
2008	11699502420.1419
2009	12528437880.8067
2010	13603970505.1482
2011	14979823165.0363
2012	16500083975.9168
2013	17463046409.7614
2014	19044872782.6528
2015	20919812014.2352
2016	22436708032.9305
2017	24305817030.312