Year	US Dollars adjusted for inflation)
1991	3625.051
1992	3829.514
1993	3823.919
1994	3501.088
1995	3523.682
1996	3370.824
1997	3410.703
1998	3352.96
1999	3319.758
2000	3583.421
2001	3567.484
2002	3550.101
2003	3522.432
2004	3486.154
2005	3484.602
2006	3473.792
2007	3397.69
2008	3308.529
2009	3271.841
2010	3242.295
2011	3228.12
2012	3225.953
2013	3239.313
2014	3205.301
2015	3138.98
2016	3116.552
2017	3136.697
2018	3183.336
2019	3232.947
2020	3285.61
2021	3340.6
2022	3398.378