Year	US Dollars adjusted for inflation)
1991	2869.697
1992	2817.257
1993	2767.708
1994	2754.108
1995	2813.127
1996	2895.011
1997	3041.778
1998	2991.237
1999	1956.931
2000	2425.334
2001	2807.873
2002	2598.596
2003	2512.476
2004	2506.475
2005	2664.477
2006	2478.83
2007	2765.449
2008	3164.172
2009	3575.008
2010	3894.962
2011	4174.657
2012	4346.076
2013	4375.208
2014	4542.127
2015	4647.32
2016	4797.19
2017	4795.307
2018	4797.805
2019	4794.199
2020	4818.099
2021	4825.562
2022	4836.582