Year	US Dollars adjusted for inflation)
1991	41666.832
1992	39249.828
1993	36915.574
1994	36578.902
1995	35229.27
1996	35049.172
1997	36220.793
1998	34224.785
1999	33745.031
2000	33764.816
2001	32201.27
2002	30830.707
2003	33349.523
2004	33769.992
2005	36326.359
2006	37636.133
2007	38907.238
2008	39029.219
2009	38036.816
2010	39104.023
2011	15279.059
2012	33110.543
2013	15930.68
2014	12161.084
2015	10897.8
2016	10546.195
2017	15478.388
2018	17314.77
2019	19211.432
2020	20605.143
2021	21952.947
2022	23300.123