Year	US Dollars adjusted for inflation)
1991	3132.321
1992	3074.636
1993	3021.084
1994	2930.731
1995	3003.882
1996	2987.042
1997	3007.726
1998	3112.592
1999	3232.54
2000	3250.358
2001	3311.518
2002	3238.865
2003	3403.875
2004	3543.958
2005	3680.938
2006	3704.748
2007	3710.218
2008	3665.687
2009	3576.557
2010	3552.592
2011	3440.872
2012	3427.787
2013	3380.186
2014	3363.192
2015	3420.191
2016	3537.273
2017	3644.316
2018	3769.212
2019	3907.941
2020	4039.518
2021	4173.623
2022	4304.727