Year | Value | 2021 | 81.437 | 2020 | 82.041 | 2019 | 82.711 | 2018 | 82.527 | 2017 | 82.601 | 2016 | 82.57 | 2015 | 82.384 | 2014 | 82.145 | 2013 | 82.034 | 2012 | 81.596 | 2011 | 81.684 | 2010 | 81.213 | 2009 | 81.481 | 2008 | 81.25 | 2007 | 80.549 | 2006 | 80.917 | 2005 | 81.078 | 2004 | 80.72 | 2003 | 80.433 | 2002 | 80.582 | 2001 | 79.921 | 2000 | 79.977 | 1999 | 79.09 | 1998 | 78.72 | 1997 | 78.86 | 1996 | 78.196 | 1995 | 77.812 | 1994 | 77.704 | 1993 | 77.21 | 1992 | 77.068 | 1991 | 76.794 | 1990 | 75.96 | 1989 | 75.749 | 1988 | 75.456 | 1987 | 75.288 | 1986 | 74.918 | 1985 | 74.453 | 1984 | 74.215 | 1983 | 73.598 | 1982 | 73.575 | 1981 | 72.936 | 1980 | 71.913 | 1979 | 71.236 | 1978 | 71.28 | 1977 | 70.433 | 1976 | 68.678 | 1975 | 69.238 | 1974 | 67.644 | 1973 | 67.334 | 1972 | 65.722 | 1971 | 65.637 | 1970 | 65.223 | 1969 | 64.761 | 1968 | 64.419 | 1967 | 63.59 | 1966 | 62.498 | 1965 | 62.031 | 1964 | 61.518 | 1963 | 60.129 | 1962 | 60.521 | 1961 | 59.995 | 1960 | 59.414 |
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