Year | Value | 2021 | 66.098 | 2020 | 66.269 | 2019 | 66.756 | 2018 | 66.482 | 2017 | 66.297 | 2016 | 65.88 | 2015 | 65.697 | 2014 | 65.284 | 2013 | 65.15 | 2012 | 64.782 | 2011 | 64.648 | 2010 | 64.436 | 2009 | 64.14 | 2008 | 64.036 | 2007 | 63.852 | 2006 | 63.731 | 2005 | 62.466 | 2004 | 63.052 | 2003 | 62.843 | 2002 | 62.626 | 2001 | 62.421 | 2000 | 62.102 | 1999 | 61.679 | 1998 | 61.09 | 1997 | 60.603 | 1996 | 60.398 | 1995 | 59.878 | 1994 | 60.116 | 1993 | 59.934 | 1992 | 60.116 | 1991 | 60.259 | 1990 | 60.066 | 1989 | 59.62 | 1988 | 59.356 | 1987 | 59.066 | 1986 | 59.464 | 1985 | 59.363 | 1984 | 59.332 | 1983 | 58.947 | 1982 | 58.416 | 1981 | 58.052 | 1980 | 57.606 | 1979 | 57.146 | 1978 | 56.737 | 1977 | 56.252 | 1976 | 56.113 | 1975 | 55.905 | 1974 | 55.472 | 1973 | 55.486 | 1972 | 55.239 | 1971 | 50.35 | 1970 | 54.76 | 1969 | 53.749 | 1968 | 52.898 | 1967 | 51.901 | 1966 | 50.842 | 1965 | 49.444 | 1964 | 48.595 | 1963 | 47.632 | 1962 | 46.608 | 1961 | 45.783 | 1960 | 44.932 |
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