Year	US Dollars adjusted for inflation)
1991	128296.438
1992	123249.102
1993	115876.656
1994	115368.555
1995	115160.633
1996	116347.18
1997	119588.023
1998	113514.484
1999	110067.336
2000	114453.586
2001	108184.727
2002	102810.383
2003	102208.836
2004	99688.781
2005	90701.258
2006	85184.703
2007	74427.234
2008	66244.242
2009	55498.695
2010	51088.199
2011	51819.027
2012	53088.367
2013	55499.238
2014	56885.371
2015	58439.934
2016	60022.949
2017	60757.629
2018	61926.34
2019	63693.941
2020	65142.312
2021	67364.023
2022	69549.406