Year	US Dollars adjusted for inflation)
1987	940.46618
1988	1001.60292
1989	1007.86638
1990	997.48761
1991	971.64067
1992	842.82437
1993	804.93811
1994	748.24733
1995	728.23518
1996	726.58415
1997	750.09138
1998	769.85432
1999	794.34939
2000	813.20377
2001	836.69865
2002	859.58213
2003	885.32213
2004	942.55405
2005	996.86805
2006	1056.66681
2007	1145.08381
2008	1228.26457
2009	1305.53821
2010	1377.08214
2011	1451.88351
2012	1547.98156
2013	1645.91072
2014	1744.49124
2015	1851.47278
2016	1961.48217
2017	2031.04775