Year	US Dollars adjusted for inflation)
1991	20857.604
1992	13817.143
1993	12145.269
1994	12888.751
1995	13333.441
1996	13921.812
1997	14147.829
1998	15313.409
1999	15975.764
2000	17407.873
2001	18395.906
2002	19266.176
2003	20850.562
2004	22486.992
2005	24556.33
2006	26046.912
2007	28039.764
2008	27220.471
2009	27002.418
2010	27479.887
2011	28647.197
2012	29242.766
2013	29559.762
2014	30336.404
2015	30814.281
2016	31473.547
2017	33131.324
2018	35326.156
2019	37195.289
2020	38938.68
2021	40703.898
2022	42576.203