Year	US Dollars adjusted for inflation)
1991	4531.646
1992	4441.002
1993	4375.872
1994	4304.961
1995	4183.718
1996	4290.653
1997	4303.012
1998	4310.458
1999	4219.192
2000	4335.781
2001	4417.705
2002	4473.125
2003	4816.821
2004	6312.144
2005	6353.174
2006	6703.467
2007	6976.168
2008	7215.891
2009	7508.462
2010	7876.545
2011	8038.334
2012	8156.663
2013	8363.413
2014	8733.582
2015	8696.882
2016	8575.972
2017	8421.067
2018	8419.847
2019	8477.936
2020	8633.493
2021	8784.304
2022	8939.664