Year	US Dollars adjusted for inflation)
1991	10148.625
1992	10364.159
1993	10161.267
1994	10105.125
1995	9977.167
1996	10239.004
1997	10240.619
1998	10194.372
1999	9815.093
2000	9119.43
2001	9465.425
2002	9473.434
2003	9613.586
2004	9813.408
2005	9982.201
2006	10015.281
2007	9957.486
2008	10638.072
2009	10519.74
2010	10774.224
2011	11438.968
2012	11691.94
2013	12112.908
2014	12434.846
2015	11785.284
2016	11182.243
2017	11305.875
2018	11436.754
2019	11527.365
2020	11668.88
2021	11854.673
2022	12070.522