Year	US Dollars adjusted for inflation)
1991	21168.73
1992	21074.537
1993	21071.832
1994	21736.4
1995	20564.998
1996	20862.676
1997	21042.736
1998	21506.508
1999	21650.633
2000	22411.799
2001	22070.742
2002	21708.354
2003	21829.248
2004	22016.824
2005	22098.744
2006	22407.547
2007	22575.541
2008	22519.623
2009	21324.744
2010	21967.529
2011	22315.299
2012	22413.539
2013	22341.234
2014	22594.959
2015	22583.395
2016	22600.52
2017	22705.369
2018	22895.4
2019	23150.482
2020	23435.67
2021	23723.318
2022	24017.264