Year | Value | 2021 | 78.54 | 2020 | 78.7 | 2019 | 79 | 2018 | 78.6 | 2017 | 78.7 | 2016 | 78.6 | 2015 | 78.3 | 2014 | 78.7 | 2013 | 78.1 | 2012 | 78.1 | 2011 | 77.9 | 2010 | 77.5 | 2009 | 77.3 | 2008 | 77.2 | 2007 | 76.9 | 2006 | 76.4 | 2005 | 76.2 | 2004 | 75.9 | 2003 | 75.6 | 2002 | 75.4 | 2001 | 75.5 | 2000 | 75 | 1999 | 74.8 | 1998 | 74.5 | 1997 | 74 | 1996 | 73.6 | 1995 | 73.3 | 1994 | 73.1 | 1993 | 72.7 | 1992 | 72.6 | 1991 | 72.1 | 1990 | 71.911 | 1989 | 72.073 | 1988 | 71.868 | 1987 | 71.668 | 1986 | 71.31 | 1985 | 71.073 | 1984 | 70.944 | 1983 | 70.468 | 1982 | 70.179 | 1981 | 69.889 | 1980 | 69.613 | 1979 | 69.457 | 1978 | 69.107 | 1977 | 69.16 | 1976 | 68.621 | 1975 | 68.169 | 1974 | 68.396 | 1973 | 68.045 | 1972 | 67.855 | 1971 | 67.707 | 1970 | 67.495 | 1969 | 67.301 | 1968 | 67.537 | 1967 | 67.881 | 1966 | 67.725 | 1965 | 67.665 | 1964 | 67.658 | 1963 | 67.237 | 1962 | 67.148 | 1961 | 67.04 | 1960 | 66.507 |
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