Year | Value | 2022 | 53.615241339399 | 2021 | 53.680068348739 | 2020 | 53.764577881892 | 2019 | 53.849432966964 | 2018 | 53.933654675739 | 2017 | 54.017572595917 | 2016 | 54.10129132556 | 2015 | 54.184657785944 | 2014 | 54.256133272403 | 2013 | 54.318316739569 | 2012 | 54.376384130391 | 2011 | 54.414739905266 | 2010 | 54.43848053561 | 2009 | 54.458592884706 | 2008 | 54.469376100952 | 2007 | 54.471880969811 | 2006 | 54.467032047091 | 2005 | 54.45049318073 | 2004 | 54.434726211352 | 2003 | 54.429025838345 | 2002 | 54.414687998679 | 2001 | 54.386713738143 | 2000 | 54.359527362248 | 1999 | 54.329938248835 | 1998 | 54.296873254961 | 1997 | 54.262131139603 | 1996 | 54.215761671823 | 1995 | 54.145729180893 | 1994 | 54.051980199919 | 1993 | 53.960094570101 | 1992 | 53.898725554221 | 1991 | 53.868137085829 | 1990 | 53.857880836219 | 1989 | 53.863535443093 | 1988 | 53.891736388066 | 1987 | 53.942150079274 | 1986 | 54.000442884565 | 1985 | 54.058259111508 | 1984 | 54.104812225063 | 1983 | 54.138934434198 | 1982 | 54.167631178393 | 1981 | 54.185640082054 | 1980 | 54.197548480057 | 1979 | 54.206285682542 | 1978 | 54.208356490702 | 1977 | 54.209148007354 | 1976 | 54.204834884509 | 1975 | 54.197144425258 | 1974 | 54.196613522235 | 1973 | 54.208695694643 | 1972 | 54.234657994616 | 1971 | 54.275775772878 | 1970 | 54.341678158216 | 1969 | 54.43138796019 | 1968 | 54.543088688118 | 1967 | 54.68270035106 | 1966 | 54.840108354176 | 1965 | 55.002546108606 | 1964 | 55.171597005559 | 1963 | 55.352686594059 | 1962 | 55.544812177652 | 1961 | 55.733535039682 | 1960 | 55.906252335499 |
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