Year | Value | 2021 | 75.1 | 2020 | 77.5 | 2019 | 78.8 | 2018 | 78.6 | 2017 | 78.4 | 2016 | 78.5 | 2015 | 78.2 | 2014 | 78 | 2013 | 78.6 | 2012 | 77.9 | 2011 | 77.8 | 2010 | 77.2 | 2009 | 77.1 | 2008 | 76.6 | 2007 | 76.3 | 2006 | 76.3 | 2005 | 76.3 | 2004 | 76.2 | 2003 | 75.6 | 2002 | 75.4 | 2001 | 75.2 | 2000 | 75.3 | 1999 | 75.1 | 1998 | 74.8 | 1997 | 73.87 | 1996 | 74.58 | 1995 | 74.9 | 1994 | 75.25 | 1993 | 75.26 | 1992 | 75.09 | 1991 | 74.88 | 1990 | 75.15 | 1989 | 75.19 | 1988 | 74.99 | 1987 | 74.81 | 1986 | 75.06 | 1985 | 74.46 | 1984 | 74.66 | 1983 | 74.48 | 1982 | 74.08 | 1981 | 74.43 | 1980 | 73.99 | 1979 | 74.11 | 1978 | 73.72 | 1977 | 73.5 | 1976 | 73.92 | 1975 | 73.58 | 1974 | 73.6 | 1973 | 73.77 | 1972 | 73.23 | 1971 | 73.24 | 1970 | 73.51 | 1969 | 72.74 | 1968 | 73.32 | 1967 | 72.56 | 1966 | 73.18 | 1965 | 73.23 | 1964 | 72.96 | 1963 | 72.02 | 1962 | 71.3 | 1961 | 72.06 | 1960 | 71.03 |
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