Year | Value | 2022 | 53.557527540279 | 2021 | 53.5552174733 | 2020 | 53.547305485874 | 2019 | 53.550122714557 | 2018 | 53.567616680089 | 2017 | 53.58732899645 | 2016 | 53.607323347623 | 2015 | 53.626025378633 | 2014 | 53.646264994708 | 2013 | 53.673916463283 | 2012 | 53.706848603839 | 2011 | 53.737495609357 | 2010 | 53.760344714214 | 2009 | 53.770045513581 | 2008 | 53.764855283497 | 2007 | 53.747557962662 | 2006 | 53.708579504111 | 2005 | 53.635328733441 | 2004 | 53.548728762191 | 2003 | 53.467185318843 | 2002 | 53.398485045718 | 2001 | 53.343221035271 | 2000 | 53.29721598183 | 1999 | 53.269360723028 | 1998 | 53.25821569437 | 1997 | 53.247161625798 | 1996 | 53.2207209345 | 1995 | 53.177580436541 | 1994 | 53.132913585261 | 1993 | 53.107690960351 | 1992 | 53.104033514714 | 1991 | 53.115059430441 | 1990 | 53.142932248071 | 1989 | 53.198351275189 | 1988 | 53.283470742627 | 1987 | 53.384581353866 | 1986 | 53.485475611962 | 1985 | 53.572215455237 | 1984 | 53.645533135524 | 1983 | 53.714691049548 | 1982 | 53.781107567462 | 1981 | 53.845094432576 | 1980 | 53.906359600808 | 1979 | 53.959752210287 | 1978 | 54.020610536143 | 1977 | 54.099011297949 | 1976 | 54.173739809832 | 1975 | 54.237148798356 | 1974 | 54.294681863999 | 1973 | 54.352738388876 | 1972 | 54.410735389257 | 1971 | 54.461369884693 | 1970 | 54.433362714876 | 1969 | 54.407841935855 | 1968 | 54.467281859495 | 1967 | 54.530663691701 | 1966 | 54.596363842844 | 1965 | 54.671633024674 | 1964 | 54.754979764421 | 1963 | 54.852301287816 | 1962 | 54.961209044279 | 1961 | 55.075532387728 | 1960 | 55.198921418988 |
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