Year	US Dollars adjusted for inflation)
1991	2800.401
1992	3102.237
1993	3227.386
1994	3281.075
1995	3319.175
1996	3343.052
1997	3235.216
1998	3344.999
1999	3124.555
2000	3153.568
2001	3277.131
2002	3411.29
2003	3234.623
2004	3427.981
2005	3596.664
2006	3655.538
2007	3790.656
2008	3899.258
2009	4031.054
2010	4103.246
2011	4201.734
2012	3386.982
2013	2679.134
2014	2803.225
2015	2775.615
2016	2704.6
2017	2587.207
2018	2575.864
2019	2538.369
2020	2576.119
2021	2536.177
2022	2482.287