Year	US Dollars adjusted for inflation)
1991	2657.585
1992	2961.059
1993	3436.723
1994	3540.815
1995	3302.384
1996	3470.255
1997	3217.905
1998	2991.265
1999	2955.432
2000	2786.197
2001	2699.193
2002	2612.653
2003	2591.966
2004	2586.483
2005	2680.823
2006	2665.122
2007	2787.481
2008	2898.298
2009	3000.878
2010	3154.024
2011	3442.886
2012	3639.448
2013	3748.298
2014	3980.473
2015	4171.826
2016	4190.753
2017	4229.147
2018	4272.061
2019	4337.786
2020	4405.87
2021	4474.626
2022	4545.707