Year	US Dollars adjusted for inflation)
1991	4029.053
1992	3878.607
1993	3710.405
1994	3588.049
1995	3668.52
1996	3837.421
1997	3867.019
1998	3947.135
1999	3921.791
2000	3762.03
2001	3721.787
2002	3620.391
2003	3535.855
2004	3544.642
2005	3567.399
2006	3573.579
2007	3585.668
2008	3621.817
2009	3679.551
2010	3689.237
2011	3460.835
2012	3760.182
2013	4010.95
2014	4273.098
2015	4567.529
2016	4872.341
2017	5086.604
2018	5311.775
2019	5538.896
2020	5767.753
2021	5947.527
2022	6126.623