Year	US Dollars
1990	6363005035.94054
1991	7244634180.03035
1992	7926786531.21566
1993	9633820299.56001
1994	10577907869.143
1995	10624041885.7297
1996	11258629137.2429
1997	11292365882.1395
1998	10931208849.2689
1999	11159520513.096
2000	11370948343.9911
2001	11381893736.4031
2002	11609396263.0197
2003	11577813389.545
2004	12513200850.7888
2005	14102591840.0777
2006	14430569911.4958
2007	16851065998.726
2008	17504551755.966
2009	18868310868.8294
2010	20438745766.39649
2011	21528235892.7229
2012	22972223648.4682
2013	24336828257.7521
2014	29047612019.9535
2015	30780931318.2106
2016	31976564236.3186
2017	33318739303.9138