Year | Value | 2021 | 76.803 | 2020 | 75.012 | 2019 | 77.001 | 2018 | 76.681 | 2017 | 76.367 | 2016 | 76.122 | 2015 | 75.925 | 2014 | 75.822 | 2013 | 75.763 | 2012 | 75.707 | 2011 | 75.528 | 2010 | 75.128 | 2009 | 74.545 | 2008 | 73.674 | 2007 | 72.591 | 2006 | 71.753 | 2005 | 70.937 | 2004 | 70.4 | 2003 | 70.179 | 2002 | 70.137 | 2001 | 70.163 | 2000 | 70.189 | 1999 | 70.081 | 1998 | 67.709 | 1997 | 69.505 | 1996 | 69.046 | 1995 | 68.614 | 1994 | 68.271 | 1993 | 67.774 | 1992 | 67.346 | 1991 | 67.014 | 1990 | 66.45 | 1989 | 65.852 | 1988 | 64.954 | 1987 | 64.142 | 1986 | 63.568 | 1985 | 62.87 | 1984 | 62.332 | 1983 | 61.96 | 1982 | 61.685 | 1981 | 61.276 | 1980 | 60.817 | 1979 | 58.648 | 1978 | 58.467 | 1977 | 59.215 | 1976 | 58.785 | 1975 | 58.434 | 1974 | 58.211 | 1973 | 58.095 | 1972 | 49.888 | 1971 | 57.739 | 1970 | 57.368 | 1969 | 56.675 | 1968 | 55.678 | 1967 | 54.407 | 1966 | 53.097 | 1965 | 51.735 | 1964 | 50.513 | 1963 | 49.518 | 1962 | 48.718 | 1961 | 48.064 | 1960 | 47.236 |
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