Year	US Dollars adjusted for inflation)
1980	3223.80899
1981	3370.52919
1982	3439.02826
1983	3548.13215
1984	3660.06888
1985	3758.34003
1986	3917.5148
1987	4148.59381
1988	4597.47543
1989	4498.55198
1990	4162.8157
1991	3849.1863
1992	3607.79367
1993	3582.85612
1994	3660.40198
1995	3781.90349
1996	3828.24642
1997	3809.68651
1998	3967.99605
1999	3750.49383
2000	3955.2758
2001	4186.92042
2002	4532.85387
2003	4804.48436
2004	5152.41401
2005	5561.16384
2006	5988.77095
2007	6476.0542
2008	6914.39843
2009	6709.52731
2010	6843.26695
2011	7019.17405
2012	7062.13498
2013	7162.99779
2014	7299.54877
2015	7612.02236
2016	7967.70817
2017	8311.9309