Year	US Dollars adjusted for inflation)
1965	2350.46228
1966	2407.33575
1967	3891.63745
1968	6875.53847
1969	8379.7089
1970	9239.1452
1971	9009.46362
1972	9545.33509
1973	7874.48593
1974	8415.42108
1975	9995.58456
1976	11458.94732
1977	10978.14347
1978	10009.71515
1979	9878.48247
1980	9907.33954
1981	10967.23886
1982	11576.72627
1983	12801.78622
1984	14210.54211
1985	15472.95366
1986	15148.19594
1987	14097.12207
1988	14419.34368
1989	15531.12761
1990	14903.15877
1991	15127.1347
1992	15659.78021
1993	15894.17039
1994	15923.71335
1995	16295.7348
1996	16548.97305
1997	17445.22727
1998	17889.47471
1999	17843.03579
2000	18698.39975
2001	19308.42061
2002	18772.80037
2003	17881.31476
2004	17671.57505
2005	17631.93969
2006	18063.25193
2007	18302.31933
2008	19112.19706
2009	19408.63402
2010	19281.00081
2011	17913.93164
2012	18300.41451
2013	17830.30899
2014	17167.05043
2015	16957.85427
2016	16962.34878
2017	16144.40722