Year	US Dollars adjusted for inflation)
1991	1706.045
1992	1683.221
1993	1677.957
1994	1691.498
1995	1725.94
1996	1894.432
1997	1985.214
1998	1398.415
1999	1392.565
2000	1440.165
2001	1435.299
2002	1387.415
2003	1361.884
2004	1366.16
2005	1386.414
2006	1380.868
2007	1387.883
2008	1393.482
2009	1399.492
2010	1420.195
2011	1510.901
2012	1437.772
2013	1408.5
2014	1401.429
2015	1427.811
2016	1465.899
2017	1485.048
2018	1505.569
2019	1529.302
2020	1555.849
2021	1582.475
2022	1610.724