Year	US Dollars adjusted for inflation)
1974	2653698663.50013
1975	2603278388.89363
1976	2717822638.00494
1977	2815664252.97312
1978	2953631801.3688
1979	3186968713.67695
1980	3327195337.07873
1981	3263978625.67424
1982	3104043673.0162
1983	3119563891.38128
1984	3231868191.47099
1985	3267418741.57717
1986	3434057097.39762
1987	3523342581.92995
1988	3646659572.2975
1989	3777939316.90021
1990	3653267319.44252
1991	3510789893.98424
1992	3265034601.40536
1993	3304215016.62221
1994	3429775187.25385
1995	3498370690.99894
1996	3638305518.6389
1997	3809305878.01493
1998	3950250195.50149
1999	3966051196.28348
2000	4057270373.79799
2001	3959895884.82684
2002	3991575051.90545
2003	4079389703.04739
2004	4136501158.89004
2005	4301961205.24564
2006	4547172993.94466
2007	4629022107.83565
2008	4633651129.9435
2009	4448305084.74574
2010	4461650000
2011	4492881549.99999
2012	4506360194.64997
2013	4506360194.64997
2014	4506360194.64997
2015	4546917436.40184
2016	4637855785.12986
2017	4715357332.99045