Year	US Dollars adjusted for inflation)
1991	3680.989
1992	3636.259
1993	3705.343
1994	3656.723
1995	3737.898
1996	3853.211
1997	3799.32
1998	3928.608
1999	3886.69
2000	3898.466
2001	3885.956
2002	3865.888
2003	3832.702
2004	3855.429
2005	3944.059
2006	3992.123
2007	4167.717
2008	4201.661
2009	4257.483
2010	4324.175
2011	4443.511
2012	4751.029
2013	4949.607
2014	4943.124
2015	5450.66
2016	5537.581
2017	5673.947
2018	5794.83
2019	5919.18
2020	6040.601
2021	6163.446
2022	6288.707