Year | Value | 2021 | 80.5 | 2020 | 80.6 | 2019 | 81 | 2018 | 80.9 | 2017 | 80.6 | 2016 | 80.7 | 2015 | 80.1 | 2014 | 80.3 | 2013 | 80.3 | 2012 | 79.9 | 2011 | 79.9 | 2010 | 79.7 | 2009 | 79.6 | 2008 | 79 | 2007 | 78.7 | 2006 | 78.7 | 2005 | 78.2 | 2004 | 78 | 2003 | 77.6 | 2002 | 77.5 | 2001 | 77.7 | 2000 | 77.1 | 1999 | 77 | 1998 | 76.1 | 1997 | 76 | 1996 | 76.3 | 1995 | 75.5 | 1994 | 75.5 | 1993 | 75.3 | 1992 | 74.7 | 1991 | 75.1 | 1990 | 74.9 | 1989 | 74.6 | 1988 | 73.9 | 1987 | 73.6 | 1986 | 73.2 | 1985 | 73.5 | 1984 | 73.1 | 1983 | 72.8 | 1982 | 72.5 | 1981 | 72.7 | 1980 | 72.1 | 1979 | 71.8 | 1978 | 71.5 | 1977 | 71.3 | 1976 | 71.2 | 1975 | 70.25 | 1974 | 70.13 | 1973 | 70.23 | 1972 | 70.2 | 1971 | 70.08 | 1970 | 69.55 | 1969 | 69.19 | 1968 | 69.32 | 1967 | 69.9 | 1966 | 70.91 | 1962 | 70.6 | 1961 | 70.47 |
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