Year | Value | 2021 | 68.623 | 2020 | 68.825 | 2019 | 69.096 | 2018 | 68.959 | 2017 | 68.816 | 2016 | 68.325 | 2015 | 68.169 | 2014 | 67.718 | 2013 | 67.616 | 2012 | 67.194 | 2011 | 67.066 | 2010 | 66.889 | 2009 | 66.531 | 2008 | 66.5 | 2007 | 66.103 | 2006 | 65.653 | 2005 | 63.967 | 2004 | 64.409 | 2003 | 63.967 | 2002 | 63.65 | 2001 | 63.575 | 2000 | 63.124 | 1999 | 62.755 | 1998 | 62.112 | 1997 | 61.486 | 1996 | 61.062 | 1995 | 60.391 | 1994 | 60.634 | 1993 | 60.369 | 1992 | 60.733 | 1991 | 61.331 | 1990 | 61.409 | 1989 | 60.731 | 1988 | 60.377 | 1987 | 59.782 | 1986 | 60.252 | 1985 | 60.403 | 1984 | 61.01 | 1983 | 60.499 | 1982 | 59.802 | 1981 | 59.301 | 1980 | 58.642 | 1979 | 58.084 | 1978 | 57.398 | 1977 | 56.857 | 1976 | 56.517 | 1975 | 56.175 | 1974 | 55.607 | 1973 | 55.546 | 1972 | 55.146 | 1971 | 52.15 | 1970 | 54.57 | 1969 | 53.276 | 1968 | 52.281 | 1967 | 51.16 | 1966 | 49.972 | 1965 | 48.462 | 1964 | 47.36 | 1963 | 46.318 | 1962 | 45.009 | 1961 | 44.18 | 1960 | 43.355 |
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