Year | Value | 2023 | 45.598943780472 | 2022 | 45.919076743716 | 2021 | 46.282273985904 | 2020 | 46.304435565508 | 2019 | 46.324723382778 | 2018 | 46.336853589562 | 2017 | 46.32425811554 | 2016 | 46.308093384223 | 2015 | 46.288633080142 | 2014 | 46.255699716987 | 2013 | 46.216903006745 | 2012 | 46.174788893488 | 2011 | 46.135363781116 | 2010 | 46.109429718088 | 2009 | 46.089520024078 | 2008 | 46.088698165295 | 2007 | 46.106736008074 | 2006 | 46.129413891781 | 2005 | 46.15917553937 | 2004 | 46.194361253863 | 2003 | 46.219562668232 | 2002 | 46.241736872338 | 2001 | 46.274872747923 | 2000 | 46.309775898017 | 1999 | 46.333992016524 | 1998 | 46.345638635277 | 1997 | 46.353045453865 | 1996 | 46.363772953292 | 1995 | 46.373821721808 | 1994 | 46.369698185411 | 1993 | 46.356051279898 | 1992 | 46.324095125796 | 1991 | 46.275439173367 | 1990 | 46.234837390487 | 1989 | 46.18684741022 | 1988 | 46.125455256873 | 1987 | 46.068486970365 | 1986 | 46.016897319602 | 1985 | 45.966373891172 | 1984 | 45.918508470425 | 1983 | 45.865368672132 | 1982 | 45.806357913096 | 1981 | 45.746007455589 | 1980 | 45.684667122371 | 1979 | 45.617576081127 | 1978 | 45.563399921452 | 1977 | 45.525174224023 | 1976 | 45.478816718889 | 1975 | 45.430074543403 | 1974 | 45.379387817474 |
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