Year	US Dollars adjusted for inflation)
1991	1228.239
1992	994.855
1993	1016.518
1994	1002.69
1995	921.946
1996	937.84
1997	877.571
1998	884.123
1999	848.764
2000	881.732
2001	788.746
2002	954.57
2003	994.31
2004	986.765
2005	1000.358
2006	1035.643
2007	1103.095
2008	1147.822
2009	1186.182
2010	1233.719
2011	1278.768
2012	1456.782
2013	1736.444
2014	1788.885
2015	1375.419
2016	1426.396
2017	1467.461
2018	1525.207
2019	1591.994
2020	1681.005
2021	1774.393
2022	1870.141