Year	US Dollars adjusted for inflation)
1991	2072.512
1992	1962.956
1993	3381.438
1994	3272.973
1995	3371.708
1996	3461.283
1997	3618.223
1998	3638.377
1999	3654.782
2000	3660.066
2001	3701.282
2002	3799.59
2003	3796.667
2004	3889.401
2005	3977.977
2006	4052.566
2007	4158.17
2008	4222.626
2009	4235.228
2010	4280.333
2011	3941.518
2012	2057.25
2013	2220.712
2014	2229.729
2015	2022.256
2016	1684.45
2017	1445.423
2018	1344.281
2019	1267.786
2020	1196.63
2021	1146.763
2022	1099.743