Year | Value | 2021 | 77.251 | 2020 | 79.895 | 2019 | 81.043 | 2018 | 81.455 | 2017 | 81.475 | 2016 | 81.264 | 2015 | 80.951 | 2014 | 80.704 | 2013 | 80.479 | 2012 | 80.32 | 2011 | 80.134 | 2010 | 79.916 | 2009 | 79.701 | 2008 | 79.439 | 2007 | 79.242 | 2006 | 78.915 | 2005 | 78.128 | 2004 | 77.852 | 2003 | 77.352 | 2002 | 77.022 | 2001 | 76.019 | 2000 | 75.462 | 1999 | 74.945 | 1998 | 74.442 | 1997 | 74.304 | 1996 | 73.571 | 1995 | 73.204 | 1994 | 73.111 | 1993 | 72.856 | 1992 | 72.506 | 1991 | 72.497 | 1990 | 71.713 | 1989 | 71.588 | 1988 | 65.896 | 1987 | 65.741 | 1986 | 68.49 | 1985 | 68.044 | 1984 | 67.931 | 1983 | 67.473 | 1982 | 53.223 | 1981 | 64.383 | 1980 | 63.997 | 1979 | 63.946 | 1978 | 63.842 | 1977 | 63.713 | 1976 | 43.061 | 1975 | 67.761 | 1974 | 68.926 | 1973 | 68.857 | 1972 | 68.54 | 1971 | 68.499 | 1970 | 68.419 | 1969 | 68.383 | 1968 | 68.315 | 1967 | 68.232 | 1966 | 67.879 | 1965 | 67.835 | 1964 | 67.71 | 1963 | 67.614 | 1962 | 67.214 | 1961 | 67.103 | 1960 | 66.651 |
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