Year	US Dollars adjusted for inflation)
1991	50806.164
1992	47818.5
1993	48699.883
1994	49245.746
1995	50416.84
1996	50824.707
1997	52358.367
1998	52574.117
1999	46145.488
2000	43889.824
2001	43551.609
2002	41979.32
2003	41508.105
2004	40271.824
2005	40237.305
2006	37420.105
2007	38387.215
2008	35599.926
2009	34196.754
2010	35455.617
2011	36350.746
2012	36521.23
2013	36888.301
2014	36818.488
2015	36705.707
2016	36377.672
2017	35598.762
2018	35375.172
2019	35598.676
2020	35945.055
2021	36469.602
2022	37066.355