Year	US Dollars adjusted for inflation)
1991	49340.227
1992	49148.832
1993	48021.688
1994	46474.117
1995	46243.754
1996	47774.379
1997	51266.699
1998	53326.121
1999	53590.445
2000	56365.652
2001	57779.598
2002	55310.891
2003	51569.547
2004	49859.465
2005	48635.086
2006	48044.684
2007	46788.047
2008	46962.41
2009	45781.09
2010	43678.094
2011	38889.305
2012	38250.48
2013	35980.695
2014	33522.898
2015	32596.777
2016	32734.738
2017	31274.555
2018	30898.789
2019	30320.049
2020	29890.471
2021	30523.412
2022	30958.613