Year	US Dollars
1990	2374323138.84296
1991	2364623498.32516
1992	2271096900.83503
1993	2339867847.20727
1994	2483104867.96954
1995	2577089660.1727
1996	2726256239.04465
1997	2912411406.47538
1998	3051695681.24818
1999	3098855069.39955
2000	3233083845.57831
2001	3215680125.08625
2002	3286265160.29795
2003	3424170131.75974
2004	3562306915.64547
2005	3763639648.85415
2006	4033982017.15465
2007	4298558678.17187
2008	4365148951.06595
2009	4241993984.64619
2010	4396713402.33642
2011	4324432732.2635
2012	4546539387.53993
2013	4595186768.26057
2014	4674449572.98924
2015	4749698304.53222
2016	4893935872.58201
2017	5093908055.26246