Year	US Dollars adjusted for inflation)
1991	6903.769
1992	8769.745
1993	10965.54
1994	11067.351
1995	10927.91
1996	11514.932
1997	13508.977
1998	17602.564
1999	20098.688
2000	19902.076
2001	19812.869
2002	17940.977
2003	11552.811
2004	17352.65
2005	17077.402
2006	17668.021
2007	16928.188
2008	17302.248
2009	17395.436
2010	17983.58
2011	18729.969
2012	20732.854
2013	21344.596
2014	20627.504
2015	20803.018
2016	22480.764
2017	21749.252
2018	21613.469
2019	21592.064
2020	21596.025
2021	21960.619
2022	22385.516