Year	US Dollars adjusted for inflation)
1960	4506.05043
1961	4717.32419
1962	4993.18686
1963	5265.18038
1964	5594.34889
1965	6036.75714
1966	6330.49059
1967	6851.41434
1968	7491.48044
1969	7719.31832
1970	8770.31069
1971	9391.60693
1972	10160.07331
1973	11294.57549
1974	11265.41683
1975	10373.80328
1976	10778.66307
1977	11262.3327
1978	11455.21025
1979	11972.13153
1980	12386.89062
1981	12478.65289
1982	12667.44163
1983	12586.97777
1984	12302.94272
1985	12613.78958
1986	13124.17865
1987	13965.44672
1988	15026.94681
1989	16018.1349
1990	16687.26509
1991	17456.38673
1992	17660.29538
1993	17278.29946
1994	17398.12751
1995	18080.54707
1996	18642.53929
1997	19380.97543
1998	20207.28368
1999	20874.57846
2000	21513.45973
2001	21777.40814
2002	21824.97562
2003	21540.06971
2004	21877.90694
2005	22004.79943
2006	22306.28405
2007	22817.3218
2008	22829.848
2009	22128.84552
2010	22538.65408
2011	22159.47542
2012	21353.23026
2013	21228.08936
2014	21533.49011
2015	22016.83692
2016	22444.07108
2017	23116.57933