Year	US Dollars adjusted for inflation)
1975	3822695809.65545
1976	4597414511.90182
1977	5349643518.09346
1978	5765706872.76689
1979	6336832967.50269
1980	6701406474.44216
1981	6870080770.90696
1982	7283777041.95428
1983	7690370711.2195
1984	8363885255.86816
1985	8772255363.60611
1986	9097175341.54466
1987	9739913596.2422
1988	10582102287.2552
1989	11423106986.154
1990	12268873770.9831
1991	12359602270.1566
1992	13521404739.1547
1993	13616054611.8052
1994	14419401666.99
1995	15640463781.8718
1996	15848953265.4901
1997	16255575303.7347
1998	17106644686.1072
1999	17932647298.311
2000	18959184071.864
2001	19641840782.8041
2002	20309487451.72701
2003	20812323859.3016
2004	21763510221.9284
2005	22574052490.8546
2006	23592183640.878
2007	24729494524.5176
2008	25685033799.3294
2009	25229779224.9492
2010	25562251655.62911
2011	25644356585.46299
2012	24860081890.0668
2013	23384894960.6211
2014	23056625341.706
2015	23512930619.0275
2016	24311614954.76011
2017	25254845995.1179