| Year | Value | | 2021 | 64.219619326501 | | 2020 | 64.263543191801 | | 2019 | 64.307467057101 | | 2018 | 64.351390922401 | | 2017 | 64.395314787701 | | 2016 | 64.430453879941 | | 2015 | 64.465592972182 | | 2014 | 64.500732064422 | | 2013 | 64.535871156662 | | 2012 | 64.571010248902 | | 2011 | 64.606149341142 | | 2010 | 64.641288433382 | | 2009 | 64.676427525622 | | 2008 | 64.711566617862 | | 2007 | 64.746705710103 | | 2006 | 64.781844802343 | | 2005 | 64.816983894583 | | 2004 | 64.852122986823 | | 2003 | 64.887262079063 | | 2002 | 64.922401171303 | | 2001 | 64.957540263543 | | 2000 | 64.992679355783 | | 1999 | 65.027818448023 | | 1998 | 65.062957540263 | | 1997 | 65.098096632504 | | 1996 | 65.133235724744 | | 1995 | 65.168374816984 | | 1994 | 65.203513909224 | | 1993 | 65.238653001464 | | 1992 | 65.273792093704 | | 1991 | 65.308931185944 | | 1990 | 65.344070278185 |
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