Year	US Dollars adjusted for inflation)
1984	422.95158
1985	432.16218
1986	440.59275
1987	421.95265
1988	401.62971
1989	445.53409
1990	462.00163
1991	468.4745
1992	481.08918
1993	496.20753
1994	523.43545
1995	547.35993
1996	572.85535
1997	600.19493
1998	612.59078
1999	645.99604
2000	672.16783
2001	699.63348
2002	729.8942
2003	762.74626
2004	799.07363
2005	842.56763
2006	900.27544
2007	952.31694
2008	1009.46077
2009	1067.57592
2010	1141.12712
2011	1215.88173
2012	1296.74567
2013	1383.70298
2014	1470.49971
2015	1556.67071
2016	1642.7301
2017	1730.40481