Year	US Dollars adjusted for inflation)
1991	3445.31
1992	3771.302
1993	3779.958
1994	3996.676
1995	4186.794
1996	4102.858
1997	3891.617
1998	3824.016
1999	3669.009
2000	3001.562
2001	2658.758
2002	2500.789
2003	2596.522
2004	2653.422
2005	2727.136
2006	2847.152
2007	2987.401
2008	3129.664
2009	2894.083
2010	3028.42
2011	3362.129
2012	3437.113
2013	3453.559
2014	3415.76
2015	3458.296
2016	3473.096
2017	3516.245
2018	3557.822
2019	3611.979
2020	3675.823
2021	3747.03
2022	3824.932