Year | Value | 2021 | 67.207 | 2020 | 69.264 | 2019 | 68.944 | 2018 | 69.285 | 2017 | 69.231 | 2016 | 68.46 | 2015 | 67.571 | 2014 | 66.6 | 2013 | 66.45 | 2012 | 66.473 | 2011 | 66.543 | 2010 | 66.539 | 2009 | 66.305 | 2008 | 65.685 | 2007 | 65.115 | 2006 | 64.509 | 2005 | 63.981 | 2004 | 63.428 | 2003 | 62.649 | 2002 | 62.589 | 2001 | 62.582 | 2000 | 62.548 | 1999 | 62.501 | 1998 | 62.623 | 1997 | 62.826 | 1996 | 62.669 | 1995 | 62.412 | 1994 | 62.379 | 1993 | 62.052 | 1992 | 61.708 | 1991 | 61.587 | 1990 | 61.378 | 1989 | 61.191 | 1988 | 60.368 | 1987 | 60.139 | 1986 | 59.922 | 1985 | 60.318 | 1984 | 60.149 | 1983 | 59.89 | 1982 | 59.768 | 1981 | 59.61 | 1980 | 59.401 | 1979 | 59.248 | 1978 | 59.128 | 1977 | 58.906 | 1976 | 58.739 | 1975 | 58.57 | 1974 | 58.401 | 1973 | 58.221 | 1972 | 58.06 | 1971 | 58.008 | 1970 | 57.964 | 1969 | 57.813 | 1968 | 57.655 | 1967 | 57.519 | 1966 | 57.322 | 1965 | 57.137 | 1964 | 57.513 | 1963 | 56.888 | 1962 | 56.386 | 1961 | 55.7 | 1960 | 55.089 |
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