Year	US Dollars adjusted for inflation)
1991	1833.196
1992	1839.714
1993	1845.662
1994	1793.666
1995	1758.277
1996	1750.262
1997	1783.647
1998	1793.367
1999	1847.259
2000	1883.263
2001	1931.467
2002	1804.118
2003	1867.142
2004	1929.854
2005	1841.095
2006	1802.17
2007	1806.971
2008	1847.016
2009	1898.812
2010	1951.828
2011	1800.194
2012	1844.339
2013	1870.856
2014	1824.396
2015	1850.766
2016	1821.064
2017	1825.971
2018	1858.629
2019	1893.215
2020	1920.752
2021	1936.505
2022	1953.992