Year | Value | 2021 | 71.1 | 2020 | 72.3 | 2019 | 73.1 | 2018 | 72.7 | 2017 | 72.5 | 2016 | 72.6 | 2015 | 72.3 | 2014 | 72.3 | 2013 | 72.2 | 2012 | 71.6 | 2011 | 71.2 | 2010 | 70.5 | 2009 | 70.1 | 2008 | 69.8 | 2007 | 69.2 | 2006 | 69 | 2005 | 68.6 | 2004 | 68.6 | 2003 | 68.3 | 2002 | 68.3 | 2001 | 68.2 | 2000 | 67.1 | 1999 | 66.36 | 1998 | 66.15 | 1997 | 66.4 | 1996 | 66.08 | 1995 | 65.26 | 1994 | 64.86 | 1993 | 64.55 | 1992 | 64.6 | 1991 | 65.06 | 1990 | 65.14 | 1989 | 65.33 | 1988 | 66.16 | 1987 | 65.7 | 1986 | 65.31 | 1985 | 65.06 | 1984 | 65.06 | 1983 | 65.12 | 1982 | 65.67 | 1981 | 65.51 | 1980 | 65.53 | 1979 | 66.23 | 1978 | 66.15 | 1977 | 66.77 | 1976 | 66.7 | 1975 | 66.29 | 1974 | 66.37 | 1973 | 66.64 | 1972 | 66.85 | 1971 | 66.15 | 1970 | 66.35 | 1969 | 66.7 | 1968 | 66.64 | 1967 | 66.89 | 1966 | 67.52 | 1965 | 66.72 | 1964 | 67.02 | 1963 | 66.64 | 1962 | 65.7 | 1961 | 66.78 | 1960 | 65.93 |
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