Year	US Dollars adjusted for inflation)
1985	1374.25583
1986	1376.99087
1987	1316.46537
1988	1452.33399
1989	1318.72397
1990	1277.5869
1991	1161.16902
1992	809.10958
1993	665.3956
1994	515.76337
1995	445.15625
1996	365.43773
1997	366.34296
1998	380.15958
1999	388.21722
2000	413.58644
2001	447.78218
2002	486.86546
2003	529.80521
2004	572.53904
2005	598.30223
2006	626.79722
2007	661.34419
2008	698.23022
2009	708.94535
2010	738.34752
2011	775.2993
2012	814.77507
2013	855.51354
2014	892.64005
2015	925.62164
2016	968.3856
2017	1015.47219