Year	US Dollars adjusted for inflation)
1991	17507.02
1992	14604.524
1993	14593.248
1994	14875.011
1995	16554.377
1996	17675.996
1997	19705.004
1998	20611.414
1999	21230.027
2000	23956.949
2001	25767.141
2002	26974.74
2003	28408.33
2004	29851.209
2005	32074.049
2006	33554.246
2007	35701.746
2008	33809.27
2009	31898.979
2010	34197.617
2011	34753.094
2012	35445.223
2013	35560.426
2014	36311.91
2015	35951.145
2016	36409.113
2017	37912.703
2018	39300.938
2019	41029.105
2020	42939.02
2021	44947.121
2022	47025.504