Year	US Dollars adjusted for inflation)
1991	17631.861
1992	18659.375
1993	19108.404
1994	20015.455
1995	21548.092
1996	23051.922
1997	24130.65
1998	24610.234
1999	24987.125
2000	26253.646
2001	26635.273
2002	27089.348
2003	27412.891
2004	28199.783
2005	29301.504
2006	30155.336
2007	30143.326
2008	30470.242
2009	30342.166
2010	29808.996
2011	30237.098
2012	31226.459
2013	31861.898
2014	32108.191
2015	32349.457
2016	32623.188
2017	32883.258
2018	33809.613
2019	34508.938
2020	35152.348
2021	35806.422
2022	36479.98