Year	US Dollars adjusted for inflation)
1997	60836.74321
1998	64697.14587
1999	69744.34876
2000	70449.03496
2001	73438.65024
2002	72748.72642
2003	74582.24862
2004	76998.21176
2005	77823.1926
2006	79802.98378
2007	84457.85947
2008	84793.64831
2009	73024.11106
2010	68758.36862
2011	61488.76786
2012	56116.95368
2013	53759.8385
2014	52708.0008
2015	52476.97013
2016	52596.2245
2017	52932.27958