Year	US Dollars
1990	12118114806.9025
1991	13324055983.6059
1992	14950156417.8008
1993	16498000583.6617
1994	17537960501.0603
1995	17875506934.4425
1996	19034977935.06909
1997	20384710518.6481
1998	22057582688.3604
1999	22981326661.2778
2000	24520704958.36309
2001	25089965949.6781
2002	26917289175.2116
2003	27742403350.5176
2004	30168591587.8697
2005	33254241611.05019
2006	37277623111.52429
2007	42363430281.94041
2008	47787043257.8095
2009	48535323404.33331
2010	50676669044.1916
2011	59623957560.3279
2012	66207340247.09701
2013	71255781671.75191
2014	76928638812.85571
2015	77404363902.5237
2016	81309746156.0388
2017	89700850896.41