Year | Value | 2021 | 81.9 | 2020 | 81 | 2019 | 82.1 | 2018 | 81.9 | 2017 | 81.6 | 2016 | 81.7 | 2015 | 80.8 | 2014 | 81.1 | 2013 | 80.7 | 2012 | 80.6 | 2011 | 80.5 | 2010 | 80.1 | 2009 | 79.8 | 2008 | 79.7 | 2007 | 79.4 | 2006 | 79.1 | 2005 | 78.7 | 2004 | 78.6 | 2003 | 78 | 2002 | 77.8 | 2001 | 77.4 | 2000 | 76.9 | 1999 | 76.8 | 1998 | 76.3 | 1997 | 76.26 | 1996 | 75.94 | 1995 | 75.3 | 1994 | 75.15 | 1993 | 74.9 | 1992 | 74.45 | 1991 | 74.1 | 1990 | 73.94 | 1989 | 74.07 | 1988 | 73.89 | 1987 | 73.9 | 1986 | 73.66 | 1985 | 73.48 | 1984 | 73.35 | 1983 | 72.68 | 1982 | 72.79 | 1981 | 72.42 | 1980 | 72.23 | 1979 | 72.31 | 1978 | 71.88 | 1977 | 71.96 | 1976 | 71.6 | 1975 | 71.49 | 1974 | 71.17 | 1973 | 70.98 | 1972 | 70.62 | 1971 | 70.16 | 1970 | 70.03 | 1969 | 69.72 | 1968 | 69.8 | 1967 | 69.7 | 1966 | 69.56 | 1965 | 69.47 | 1964 | 69.19 | 1963 | 68.29 | 1962 | 68.44 | 1961 | 68.84 | 1960 | 68.65 |
|