Year | Value | 2022 | 54.080923256284 | 2021 | 53.717726014096 | 2020 | 53.695566711894 | 2019 | 53.675276617222 | 2018 | 53.663146410438 | 2017 | 53.67574188446 | 2016 | 53.691906615777 | 2015 | 53.711366919858 | 2014 | 53.744300283013 | 2013 | 53.783096993255 | 2012 | 53.825213308853 | 2011 | 53.864636218884 | 2010 | 53.890568092915 | 2009 | 53.910479975922 | 2008 | 53.911299663762 | 2007 | 53.893266151143 | 2006 | 53.870586108219 | 2005 | 53.84082446063 | 2004 | 53.805638746137 | 2003 | 53.780439432359 | 2002 | 53.758265212014 | 2001 | 53.725127252077 | 2000 | 53.690226147819 | 1999 | 53.666010011046 | 1998 | 53.654361364723 | 1997 | 53.646956539384 | 1996 | 53.636227046708 | 1995 | 53.626178278192 | 1994 | 53.630301814589 | 1993 | 53.643946788795 | 1992 | 53.675902943149 | 1991 | 53.72455889138 | 1990 | 53.765162609513 | 1989 | 53.81315258978 | 1988 | 53.874542796555 | 1987 | 53.931513029635 | 1986 | 53.98310072256 | 1985 | 54.033628072793 | 1984 | 54.081491529575 | 1983 | 54.134631327868 | 1982 | 54.193642086904 | 1981 | 54.253994536882 | 1980 | 54.315330876585 | 1979 | 54.382423918873 | 1978 | 54.436600078548 | 1977 | 54.474825775977 | 1976 | 54.521183281111 | 1975 | 54.56992341128 | 1974 | 54.620612182526 | 1973 | 54.679949387957 | 1972 | 54.749699041278 | 1971 | 54.824471136833 | 1970 | 54.82850916365 | 1969 | 54.813268163537 | 1968 | 54.860575690515 | 1967 | 54.918130859556 | 1966 | 54.9775241262 | 1965 | 55.042904159687 | 1964 | 55.11404783375 | 1963 | 55.19652958789 | 1962 | 55.288117144877 | 1961 | 55.382402196562 | 1960 | 55.483037710326 |
|