Year	US Dollars adjusted for inflation)
1991	1423.237
1992	1592.366
1993	1783.869
1994	1989.457
1995	2187.949
1996	2369.707
1997	2562.797
1998	2746.495
1999	2930.311
2000	3137.63
2001	3376.824
2002	3650.321
2003	3975.894
2004	4341.306
2005	4793.566
2006	5366.526
2007	6081.977
2008	6679.556
2009	7280.434
2010	8032.312
2011	8774.075
2012	9445.963
2013	10164.104
2014	10898.058
2015	11645.383
2016	12448.341
2017	13334.094
2018	14249.305
2019	15183.48
2020	16142.473
2021	17126.064
2022	18144.291