Year	US Dollars adjusted for inflation)
1991	21857.352
1992	20690.268
1993	20290.336
1994	20301.875
1995	19562.555
1996	20935.699
1997	21499.416
1998	21702.967
1999	21823.131
2000	21617.881
2001	22414.053
2002	23376.135
2003	23602.963
2004	23283.285
2005	23660.748
2006	24070.285
2007	24739.645
2008	24536.357
2009	24955.539
2010	26523.16
2011	26962.102
2012	26937.816
2013	26790.633
2014	26792.461
2015	26186.1
2016	26320.994
2017	26613.824
2018	26831.994
2019	27132.717
2020	27313.062
2021	27587.637
2022	27943.15