Year	US Dollars adjusted for inflation)
1982	303.28192
1983	311.08578
1984	300.40771
1985	281.11122
1986	272.74973
1987	273.78401
1988	286.08097
1989	293.74082
1990	302.12614
1991	308.27306
1992	308.34306
1993	323.22896
1994	333.00518
1995	359.76429
1996	380.3387
1997	387.60066
1998	394.24734
1999	412.79852
2000	412.19643
2001	419.33583
2002	440.65222
2003	453.19784
2004	467.48002
2005	480.09541
2006	513.75282
2007	538.03943
2008	565.06792
2009	583.09709
2010	595.20617
2011	629.24052
2012	631.55519
2013	632.48621
2014	642.87739
2015	654.13658
2016	662.4344
2017	666.60584