Year	US Dollars adjusted for inflation)
1991	2787.906
1992	2915.223
1993	2936.381
1994	3042.611
1995	3069.553
1996	3196.972
1997	3263.614
1998	3114.202
1999	2709.936
2000	2844.925
2001	2965.688
2002	3004.149
2003	3169.728
2004	3239.72
2005	3380.376
2006	3541.842
2007	3732.165
2008	4004.331
2009	3914.279
2010	4018.021
2011	4116.366
2012	4182.494
2013	4097.262
2014	4117.954
2015	4264.587
2016	4295.004
2017	4374.803
2018	4471.27
2019	4575.07
2020	4699.632
2021	4838.219
2022	4987.978