Year	US Dollars adjusted for inflation)
1991	12936.831
1992	14199.934
1993	13649.197
1994	13059.796
1995	12415.904
1996	12121.666
1997	12206.729
1998	12318.912
1999	12507.394
2000	12798.415
2001	13355.214
2002	14025.585
2003	14306.294
2004	15063.176
2005	15764.583
2006	16287.818
2007	16112.084
2008	16484.488
2009	16229.815
2010	15944.634
2011	15802.837
2012	15545.607
2013	15618.854
2014	15232.715
2015	15149.73
2016	15292.044
2017	15815.593
2018	15769.801
2019	15808.006
2020	15939.262
2021	16296.01
2022	16678.043