Year	US Dollars adjusted for inflation)
1991	458.748
1992	404.833
1993	443.09
1994	441.288
1995	454.05
1996	497.85
1997	500
1998	470.939
1999	484.518
2000	491.382
2001	509.824
2002	494.948
2003	463.363
2004	504.823
2005	540.598
2006	581.175
2007	628.177
2008	674.326
2009	710.138
2010	773.23
2011	830.599
2012	871.415
2013	931.039
2014	994.179
2015	1063.184
2016	1108.899
2017	1169.756
2018	1226.969
2019	1283.752
2020	1333.255
2021	1383.418
2022	1436.326