Year	US Dollars adjusted for inflation)
1991	11204.484
1992	11645.758
1993	11990.529
1994	11747.212
1995	12367.497
1996	12434.672
1997	12653.777
1998	12988.964
1999	13227.56
2000	13312.595
2001	13342.107
2002	13798.662
2003	14531.101
2004	14865.912
2005	14982.791
2006	15800.575
2007	15365.783
2008	16226.024
2009	15741.141
2010	15074.605
2011	14866.602
2012	14917.465
2013	15041.324
2014	15153.238
2015	15289.682
2016	15610.51
2017	15963.615
2018	16385.977
2019	16844.025
2020	17343.348
2021	17889.002
2022	18458.092