Year	US Dollars adjusted for inflation)
1991	52892.77
1992	51754.457
1993	50634.66
1994	50242.578
1995	50117.348
1996	50602.691
1997	52413.531
1998	53676.113
1999	55025.289
2000	56372.844
2001	58970.141
2002	60332.832
2003	62809.105
2004	65466.797
2005	65672.836
2006	68027.773
2007	69632.477
2008	68694.367
2009	66380.961
2010	64727.402
2011	63338.801
2012	64276.004
2013	65346.223
2014	65374.766
2015	63926.426
2016	62756.523
2017	62397.902
2018	63590.141
2019	64547.254
2020	66006.195
2021	67859.586
2022	70075.953