Year	US Dollars adjusted for inflation)
1981	8227603582.40039
1982	8302969571.40326
1983	8986719590.41069
1984	8730775888.58718
1985	7757787405.87652
1986	8507314752.68832
1987	9686371612.14659
1988	9735159432.65081
1989	9700011206.06829
1990	9964477334.54832
1991	9253264786.76098
1992	8450777236.91963
1993	9561448857.46773
1994	9866455688.41206
1995	10471023886.7174
1996	11772171511.4072
1997	12141100402.7987
1998	11721244256.7242
1999	12326311977.6713
2000	13074915712.856
2001	14160304517.4679
2002	14374794288.2309
2003	14064103274.4481
2004	15972968198.9981
2005	17860775923.3616
2006	19795942247.5789
2007	22063798449.7811
2008	24444156129.287
2009	26595865977.4424
2010	29933790334.3418
2011	33279878092.46
2012	36157859262.3838
2013	39984181570.29459
2014	44085556181.8802
2015	48667131306.04168
2016	52347226230.2332
2017	57710624015.1401