Year	US Dollars adjusted for inflation)
1991	1064.451
1992	1006.881
1993	975.424
1994	942.691
1995	977.512
1996	1008.722
1997	1058.342
1998	1069.348
1999	1079.115
2000	1083.496
2001	1101.581
2002	1134.539
2003	1134.157
2004	1163.565
2005	1191.212
2006	1216.088
2007	1250.826
2008	1272.063
2009	1297.696
2010	1335.56
2011	1368.717
2012	1341.238
2013	1320.71
2014	1306.103
2015	1292.738
2016	1281.45
2017	1264.382
2018	1255.482
2019	1249.457
2020	1246.2
2021	1249.526
2022	1251.375