Year	US Dollars adjusted for inflation)
1991	4490.908
1992	4416.75
1993	4069.562
1994	3981.6
1995	3775.109
1996	3519.09
1997	3384.193
1998	3275.985
1999	3238.599
2000	3148.208
2001	3135.694
2002	3144.985
2003	3174.25
2004	3224.756
2005	3255.224
2006	3336.765
2007	3427.353
2008	3542.916
2009	3630.345
2010	3668.178
2011	3739.125
2012	3819.44
2013	3909.366
2014	4041.935
2015	4201.405
2016	4407.096
2017	4638.538
2018	4884.451
2019	5144.37
2020	5368.32
2021	5607.087
2022	5856.681