Year	US Dollars
1990	947640755.45726
1991	1064031004.70003
1992	1260931892.21674
1993	1545077413.70568
1994	1803274083.25602
1995	1981113859.11525
1996	2198928426.62368
1997	2314924546.77727
1998	2311589276.77276
1999	2458525014.82899
2000	2502547725.2815
2001	2583729964.39855
2002	2675453656.45999
2003	2725147261.40057
2004	2669441187.24268
2005	2958244435.58171
2006	3506967143.55138
2007	3817175822.90969
2008	3918802735.14003
2009	4024912066.58682
2010	4301473815.69166
2011	4576050795.78135
2012	4965158867.91347
2013	5203468911.58499
2014	5505499538.43342
2015	5759932005.56703
2016	6051872402.40733
2017	6313198587.80457