Year | Value | 2021 | 87.57 | 2020 | 87.71 | 2019 | 87.45 | 2018 | 87.32 | 2017 | 87.26 | 2016 | 87.14 | 2015 | 86.99 | 2014 | 86.83 | 2013 | 86.61 | 2012 | 86.41 | 2011 | 85.9 | 2010 | 86.3 | 2009 | 86.44 | 2008 | 86.05 | 2007 | 85.99 | 2006 | 85.81 | 2005 | 85.52 | 2004 | 85.59 | 2003 | 85.33 | 2002 | 85.23 | 2001 | 84.93 | 2000 | 84.6 | 1999 | 83.99 | 1998 | 84.01 | 1997 | 83.82 | 1996 | 83.59 | 1995 | 82.85 | 1994 | 82.98 | 1993 | 82.51 | 1992 | 82.22 | 1991 | 82.11 | 1990 | 81.9 | 1989 | 81.77 | 1988 | 81.3 | 1987 | 81.39 | 1986 | 80.93 | 1985 | 80.48 | 1984 | 80.18 | 1983 | 79.78 | 1982 | 79.66 | 1981 | 79.13 | 1980 | 78.76 | 1979 | 78.89 | 1978 | 78.33 | 1977 | 77.95 | 1976 | 77.35 | 1975 | 76.89 | 1974 | 76.31 | 1973 | 76.02 | 1972 | 75.94 | 1971 | 75.58 | 1970 | 74.66 | 1969 | 74.67 | 1968 | 74.3 | 1967 | 74.15 | 1966 | 73.61 | 1965 | 72.92 | 1964 | 72.87 | 1963 | 72.34 | 1962 | 71.16 | 1961 | 70.79 | 1960 | 70.19 |
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