Year | Value | 2021 | 69.9 | 2020 | 70.1 | 2019 | 71.6 | 2018 | 70.9 | 2017 | 70.7 | 2016 | 69.5 | 2015 | 69.2 | 2014 | 69.2 | 2013 | 68.5 | 2012 | 68.4 | 2011 | 68.1 | 2010 | 68 | 2009 | 67.5 | 2008 | 66.3 | 2007 | 64.9 | 2006 | 65.3 | 2005 | 65.4 | 2004 | 66.4 | 2003 | 66.5 | 2002 | 66.2 | 2001 | 66 | 2000 | 66.8 | 1999 | 66.4 | 1998 | 66 | 1997 | 65.47 | 1996 | 64.63 | 1995 | 63.26 | 1994 | 62.54 | 1993 | 63.13 | 1992 | 64.81 | 1991 | 65.13 | 1990 | 66.39 | 1989 | 66.84 | 1988 | 67.45 | 1987 | 67.72 | 1986 | 67.91 | 1985 | 65.75 | 1984 | 65.32 | 1983 | 65.89 | 1982 | 65.91 | 1981 | 65.49 | 1980 | 65.57 | 1979 | 65.57 | 1978 | 65.99 | 1977 | 66.19 | 1976 | 66.28 | 1975 | 66.36 | 1974 | 67.01 | 1973 | 67.22 | 1972 | 66.81 | 1971 | 67.55 | 1970 | 66.78 | 1969 | 67.07 | 1968 | 67.66 | 1967 | 67.96 | 1966 | 68.13 | 1965 | 68.13 | 1964 | 68.27 | 1963 | 66.78 | 1962 | 65.91 | 1961 | 66.81 | 1960 | 66.94 |
|