Year | Value | 2021 | 78.71 | 2020 | 78.946 | 2019 | 79.726 | 2018 | 79.627 | 2017 | 79.504 | 2016 | 79.335 | 2015 | 79.223 | 2014 | 79.044 | 2013 | 78.853 | 2012 | 78.716 | 2011 | 78.517 | 2010 | 78.334 | 2009 | 78.003 | 2008 | 77.488 | 2007 | 77.129 | 2006 | 76.909 | 2005 | 76.683 | 2004 | 76.453 | 2003 | 76.222 | 2002 | 74.901 | 2001 | 74.636 | 2000 | 74.38 | 1999 | 73.67 | 1998 | 73.066 | 1997 | 72.937 | 1996 | 72.767 | 1995 | 72.695 | 1994 | 72.598 | 1993 | 72.521 | 1992 | 72.306 | 1991 | 72.241 | 1990 | 71.9 | 1989 | 71.757 | 1988 | 71.606 | 1987 | 71.491 | 1986 | 70.964 | 1985 | 70.747 | 1984 | 70.485 | 1983 | 69.949 | 1982 | 69.66 | 1981 | 69.085 | 1980 | 68.53 | 1979 | 67.846 | 1978 | 67.209 | 1977 | 66.514 | 1976 | 65.82 | 1975 | 65.08 | 1974 | 64.338 | 1973 | 63.351 | 1972 | 62.304 | 1971 | 61.211 | 1970 | 60.021 | 1969 | 58.76 | 1968 | 57.54 | 1967 | 56.339 | 1966 | 55.185 | 1965 | 53.985 | 1964 | 52.848 | 1963 | 51.584 | 1962 | 50.686 | 1961 | 49.695 | 1960 | 48.811 |
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