Year | Value | 2021 | 87.9 | 2020 | 87.7 | 2019 | 88.1 | 2018 | 87.7 | 2017 | 87.6 | 2016 | 87.3 | 2015 | 87.3 | 2014 | 86.9 | 2013 | 86.7 | 2012 | 86.4 | 2011 | 86.7 | 2010 | 86 | 2009 | 85.9 | 2008 | 85.5 | 2007 | 85.4 | 2006 | 85.5 | 2005 | 84.6 | 2004 | 84.8 | 2003 | 84.4 | 2002 | 84.5 | 2001 | 84.6 | 2000 | 83.9 | 1999 | 83.2 | 1998 | 83 | 1997 | 83.2 | 1996 | 82.7 | 1995 | 81.5 | 1994 | 81.5 | 1993 | 80.9 | 1992 | 80.7 | 1991 | 80.7 | 1990 | 80.3 | 1989 | 80 | 1988 | 79.9 | 1987 | 79.7 | 1986 | 79.4 | 1985 | 79.2 | 1984 | 79 | 1983 | 78.4 | 1982 | 78.4 | 1981 | 78.5 | 1980 | 77.9 | 1979 | 76.9 | 1978 | 76.7 | 1977 | 76.7 | 1976 | 76.2 | 1975 | 76.8 | 1974 | 76.3 | 1973 | 75.9 | 1972 | 75.4 | 1971 | 75.3 | 1970 | 75.105 | 1969 | 74.451 | 1968 | 74.206 | 1967 | 73.792 | 1966 | 73.618 | 1965 | 73.337 | 1964 | 72.747 | 1963 | 72.044 | 1962 | 71.17 | 1961 | 70.848 | 1960 | 70.264 |
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