Year	US Dollars adjusted for inflation)
1960	2829.64066
1961	2616.87435
1962	2762.64714
1963	2966.28182
1964	3064.13408
1965	2956.45217
1966	3284.39083
1967	3220.81029
1968	3381.23324
1969	3301.74698
1970	3511.84863
1971	3987.0864
1972	4137.68674
1973	4443.8728
1974	4420.57211
1975	4456.79835
1976	5078.45063
1977	4665.23288
1978	5618.90592
1979	6450.74195
1980	6120.53884
1981	5549.82339
1982	5455.59002
1983	5368.84191
1984	5577.91764
1985	6148.43451
1986	6099.42159
1987	6103.37376
1988	6408.80583
1989	7084.06687
1990	7542.55943
1991	7648.21345
1992	8158.41126
1993	8485.29143
1994	8196.09255
1995	8009.7945
1996	8281.2801
1997	9163.68507
1998	9741.3605
1999	9730.69992
2000	9790.27077
2001	9559.55196
2002	9384.15248
2003	8932.19505
2004	8709.78269
2005	9450.27943
2006	10126.29048
2007	11124.65711
2008	10645.0867
2009	10486.18989
2010	10804.68447
2011	11967.36235
2012	11999.95385
2013	12489.31485
2014	12850.49315
2015	13187.612
2016	13598.33627
2017	13997.0845