Year	US Dollars adjusted for inflation)
1991	21564.277
1992	21844.27
1993	22587.678
1994	23664.508
1995	24538.303
1996	25382.424
1997	24225.676
1998	24707.746
1999	23873.779
2000	23217.637
2001	23023.258
2002	22459.787
2003	21802.322
2004	21899.271
2005	21588.279
2006	21304.908
2007	22906.938
2008	24336.91
2009	25891.537
2010	26839.92
2011	25777.939
2012	24482.123
2013	22926.824
2014	21917.684
2015	21157.504
2016	20746.152
2017	20992.623
2018	21425.941
2019	21953.932
2020	22619.238
2021	23793.064
2022	25007.838