Year	US Dollars adjusted for inflation)
1990	972.5828
1991	984.43006
1992	1012.15139
1993	1000.71582
1994	1018.88647
1995	1032.52087
1996	1041.70349
1997	1061.49077
1998	1092.80107
1999	1102.61306
2000	1138.24712
2001	1148.42759
2002	1160.24322
2003	1170.14357
2004	1182.89823
2005	1214.70464
2006	1219.00744
2007	1225.47236
2008	1235.81157
2009	1249.03365
2010	1309.23193
2011	1112.35191
2012	1108.89498
2013	1132.09746
2014	1101.11723
2015	674.86354
2016	432.3861