Year	US Dollars adjusted for inflation)
1990	1298.7173
1991	1338.43938
1992	1466.23794
1993	1481.86304
1994	1572.83907
1995	1654.79807
1996	1634.74269
1997	1566.7746
1998	1551.05943
1999	1501.69195
2000	1252.89415
2001	1122.34615
2002	1062.32544
2003	1102.23683
2004	1127.07832
2005	1158.94557
2006	1209.75068
2007	1267.96836
2008	1326.86963
2009	1235.71779
2010	1290.57237
2011	1428.861
2012	1461.67126
2013	1473.76478
2014	1475.52805
2015	1482.19059
2016	1502.88704
2017	1521.2943