Year | Value | 2021 | 81.47 | 2020 | 81.56 | 2019 | 81.41 | 2018 | 81.25 | 2017 | 81.09 | 2016 | 80.98 | 2015 | 80.75 | 2014 | 80.5 | 2013 | 80.21 | 2012 | 79.94 | 2011 | 79.44 | 2010 | 79.55 | 2009 | 79.59 | 2008 | 79.29 | 2007 | 79.19 | 2006 | 79 | 2005 | 78.56 | 2004 | 78.64 | 2003 | 78.36 | 2002 | 78.32 | 2001 | 78.07 | 2000 | 77.72 | 1999 | 77.1 | 1998 | 77.16 | 1997 | 77.19 | 1996 | 77.01 | 1995 | 76.38 | 1994 | 76.57 | 1993 | 76.25 | 1992 | 76.09 | 1991 | 76.11 | 1990 | 75.92 | 1989 | 75.91 | 1988 | 75.54 | 1987 | 75.61 | 1986 | 75.23 | 1985 | 74.78 | 1984 | 74.54 | 1983 | 74.2 | 1982 | 74.22 | 1981 | 73.79 | 1980 | 73.35 | 1979 | 73.46 | 1978 | 72.97 | 1977 | 72.69 | 1976 | 72.15 | 1975 | 71.73 | 1974 | 71.16 | 1973 | 70.7 | 1972 | 70.5 | 1971 | 70.17 | 1970 | 69.31 | 1969 | 69.18 | 1968 | 69.05 | 1967 | 68.91 | 1966 | 68.35 | 1965 | 67.74 | 1964 | 67.67 | 1963 | 67.21 | 1962 | 66.23 | 1961 | 66.03 | 1960 | 65.32 |
|