Year	US Dollars adjusted for inflation)
1991	1184.327
1992	1078.15
1993	1051.923
1994	1074.773
1995	1119.183
1996	1046.892
1997	1080.478
1998	1105.124
1999	1119.397
2000	1065.797
2001	1093.424
2002	1112.233
2003	1031.354
2004	1075.272
2005	1065.122
2006	1098.32
2007	1130.132
2008	1135.009
2009	1139.243
2010	1162.533
2011	1197.786
2012	1248.419
2013	788.784
2014	799.741
2015	837.112
2016	864.583
2017	889.76
2018	918.6
2019	950.555
2020	986.341
2021	1015.776
2022	1046.709