Year	US Dollars adjusted for inflation)
1991	2799.182
1992	2916.953
1993	2890.373
1994	2895.055
1995	3045.698
1996	3077.316
1997	2996.71
1998	2984.05
1999	2991.972
2000	3042.502
2001	3044.85
2002	3052.077
2003	3087.251
2004	3153.636
2005	3244.305
2006	3226.976
2007	3278.816
2008	3255.573
2009	3242.958
2010	3181.611
2011	3195.256
2012	3237.97
2013	3309.091
2014	3348.715
2015	3422.135
2016	3460.495
2017	3574.458
2018	3697.794
2019	3829.488
2020	3969.014
2021	4116.168
2022	4270.386