Year | Value | 2021 | 74.3 | 2020 | 75.3 | 2019 | 76.4 | 2018 | 76.2 | 2017 | 76.1 | 2016 | 76.1 | 2015 | 75.7 | 2014 | 75.8 | 2013 | 75.2 | 2012 | 75.1 | 2011 | 74.8 | 2010 | 74.4 | 2009 | 74.2 | 2008 | 74 | 2007 | 73.7 | 2006 | 73.5 | 2005 | 72.9 | 2004 | 72.6 | 2003 | 72 | 2002 | 72.1 | 2001 | 72.1 | 2000 | 71.7 | 1999 | 71.4 | 1998 | 71.1 | 1997 | 70.42 | 1996 | 70.3 | 1995 | 69.67 | 1994 | 69.48 | 1993 | 69.28 | 1992 | 68.54 | 1991 | 68.23 | 1990 | 67.54 | 1989 | 68.1 | 1988 | 68.1 | 1987 | 67.87 | 1986 | 67.49 | 1985 | 67.5 | 1984 | 67.34 | 1983 | 67.05 | 1982 | 67.32 | 1981 | 67.21 | 1980 | 66.8 | 1979 | 67.33 | 1978 | 67.2 | 1977 | 67.11 | 1976 | 67.04 | 1975 | 67 | 1974 | 66.75 | 1973 | 66.53 | 1972 | 66.84 | 1971 | 66.16 | 1970 | 66.05 | 1969 | 65.85 | 1968 | 66.47 | 1967 | 67.03 | 1966 | 67.18 | 1965 | 67.09 | 1964 | 67.44 | 1963 | 67.28 | 1962 | 66.86 | 1961 | 67.62 | 1960 | 67.5 |
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