Year	US Dollars adjusted for inflation)
1991	3781.034
1992	3584.823
1993	4310.85
1994	4746.689
1995	5442.464
1996	5862.876
1997	4927.79
1998	5541.35
1999	6367.544
2000	6583.065
2001	7124.672
2002	7221.485
2003	7615.178
2004	8022.399
2005	8465.542
2006	8893.74
2007	9395.124
2008	10211.011
2009	10741.784
2010	11234.74
2011	11097.804
2012	10742.716
2013	11805.367
2014	11997.52
2015	11677.663
2016	11796.899
2017	12093.948
2018	12558.708
2019	13081.535
2020	13620.224
2021	14197.581
2022	14797.101