Year	US Dollars adjusted for inflation)
1977	2519.28396
1978	2784.34826
1979	2250.09867
1980	2557.69893
1981	2864.46065
1982	2991.02434
1983	3088.9157
1984	3279.96482
1985	3347.81114
1986	3615.09773
1987	3922.08506
1988	4295.04783
1989	4314.6745
1990	4561.6398
1991	4594.81321
1992	4680.42866
1993	4743.06437
1994	4799.96591
1995	4895.09467
1996	5040.16119
1997	5143.64164
1998	5435.26438
1999	5502.69982
2000	5541.34678
2001	5568.04254
2002	5458.36056
2003	5855.39819
2004	6021.13907
2005	5994.70187
2006	6154.64218
2007	6530.48865
2008	6983.30311
2009	6886.59695
2010	6912.43571
2011	6869.73447
2012	6765.23539
2013	6691.06428
2014	6951.0324
2015	6738.66124
2016	6880.6258
2017	6556.65178