Year	US Dollars adjusted for inflation)
1975	102479.18903
1976	102319.72751
1977	107452.18038
1978	92822.3616
1979	100480.43676
1980	113682.03824
1981	110644.55156
1982	97254.06152
1983	87942.90269
1984	86936.84909
1985	79439.28663
1986	63832.13125
1987	62248.92875
1988	57136.0526
1989	60523.22813
1990	67606.91692
1991	64386.09112
1992	62821.15769
1993	60133.19296
1994	60932.27764
1995	61818.23378
1996	62294.12897
1997	64176.48416
1998	61231.22972
1999	59845.03704
2000	62833.25107
2001	60434.67398
2002	58707.00717
2003	59867.28994
2004	60042.59735
2005	56199.02927
2006	53926.5971
2007	48260.01091
2008	43658.94478
2009	37203.39799
2010	35037.89267
2011	35730.32935
2012	36376.45368
2013	37765.71684
2014	39146.11209
2015	40753.88634
2016	41449.68142
2017	41197.16878