| Year | Value | | 2022 | 44.22412528654 | | 2021 | 44.36173228579 | | 2020 | 44.151936600811 | | 2019 | 45.165139912618 | | 2018 | 45.028761181403 | | 2017 | 44.663318764976 | | 2016 | 44.791980638997 | | 2015 | 43.979195038716 | | 2014 | 43.498453736643 | | 2013 | 42.96169778592 | | 2012 | 42.508753658932 | | 2011 | 41.674044644137 | | 2010 | 40.992263034972 | | 2009 | 40.577001542637 | | 2008 | 40.329690132925 | | 2007 | 39.857926304206 | | 2006 | 39.35583638798 | | 2005 | 38.891213063096 | | 2004 | 38.235240279831 | | 2003 | 37.620981870174 | | 2002 | 37.364507247972 | | 2001 | 37.018263956447 | | 2000 | 36.580863125951 | | 1999 | 36.292529266987 | | 1998 | 36.024213946713 | | 1997 | 35.979269805815 | | 1996 | 35.73995837482 | | 1995 | 35.485555519263 | | 1994 | 35.338009745932 | | 1993 | 35.229024309898 | | 1992 | 35.132539113923 | | 1991 | 35.052567531247 |
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