Year	US Dollars adjusted for inflation)
1975	2760204463.00039
1976	2661607341.54223
1977	2930196818.55557
1978	3153287280.52598
1979	2963248949.11626
1980	2809101030.24448
1981	2816260976.33533
1982	2759450908.33333
1983	2675496878.07238
1984	2571036689.2005
1985	2523268316.58798
1986	2433807126.87959
1987	2089096188.52474
1988	2272359780.57634
1989	2522740026.20726
1990	2510412978.48291
1991	2580255425.98859
1992	2575058064.97333
1993	2388247352.91935
1994	2465797921.63316
1995	2492835111.50222
1996	2524603235.63073
1997	2669426894.12442
1998	2711182103.1836
1999	2687566144.6827
2000	2685720130.27299
2001	2808003046.9639
2002	2928745617.03153
2003	3104767754.78462
2004	3392146050.41776
2005	3547191376.09683
2006	3683479343.30695
2007	3871759940.85243
2008	4032182694.88354
2009	4153700529.52386
2010	4368398047.64333
2011	4623921715.74078
2012	4748321396.2619
2013	4887610613.83381
2014	4900098612.65061
2015	4772817086.24868
2016	4527379878.73403
2017	4531702647.55523