Year	US Dollars adjusted for inflation)
1980	2110.63322
1981	2187.64281
1982	2205.05294
1983	2182.63192
1984	2110.44143
1985	2104.30858
1986	2180.37209
1987	2120.42284
1988	2051.24357
1989	2193.26382
1990	1947.88354
1991	1379.81698
1992	1288.25896
1993	1420.57329
1994	1547.95435
1995	1764.6993
1996	1937.29007
1997	1738.16646
1998	1906.71726
1999	2177.89663
2000	2337.94239
2001	2547.37732
2002	2663.14048
2003	2827.45578
2004	3001.40862
2005	3189.39511
2006	3383.89373
2007	3610.72755
2008	3775.38099
2009	3928.33864
2010	4094.35883
2011	4210.0822
2012	4276.92155
2013	4327.64452
2014	4413.56158
2015	4524.64443
2016	4683.80021
2017	4868.19735