Year	US Dollars adjusted for inflation)
1980	54891.43471
1981	55466.16352
1982	54420.97193
1983	54534.42609
1984	55973.70111
1985	57774.34434
1986	58542.71181
1987	59098.51838
1988	60588.59717
1989	62703.5288
1990	64343.51842
1991	62962.39135
1992	62244.79697
1993	61602.79012
1994	61889.66595
1995	61773.0963
1996	61833.00711
1997	63127.73967
1998	64822.29415
1999	65607.20926
2000	67807.92681
2001	68264.52626
2002	67860.24483
2003	67385.29767
2004	68781.61259
2005	70471.43852
2006	72823.83726
2007	75143.70222
2008	75793.63304
2009	73189.19255
2010	74605.72102
2011	75029.75782
2012	74984.13712
2013	75499.70674
2014	76410.85666
2015	76472.45949
2016	76682.6448
2017	76667.44404