Year	US Dollars adjusted for inflation)
1991	21491.717
1992	16871.576
1993	14307.931
1994	13037.013
1995	13364.685
1996	13962.484
1997	14837.331
1998	15989.992
1999	15732.356
2000	17144.023
2001	18891.961
2002	19501.262
2003	20795.877
2004	22798.904
2005	24422.803
2006	26130.547
2007	28612.746
2008	29949.787
2009	27775.422
2010	29778.428
2011	30591.264
2012	31260.311
2013	32112.908
2014	32770.598
2015	33045.859
2016	32950.148
2017	34465.551
2018	36167.297
2019	37895.09
2020	39595.77
2021	41361.117
2022	43208.273