Year | Value | 2021 | 78.2 | 2020 | 80 | 2019 | 80.1 | 2018 | 79.7 | 2017 | 79.7 | 2016 | 79.6 | 2015 | 79.5 | 2014 | 79.4 | 2013 | 78.9 | 2012 | 78.9 | 2011 | 78.8 | 2010 | 78.4 | 2009 | 78.1 | 2008 | 77.9 | 2007 | 76.5 | 2006 | 76.5 | 2005 | 77.4 | 2004 | 77.2 | 2003 | 76.9 | 2002 | 76.8 | 2001 | 76.6 | 2000 | 76 | 1999 | 75.29 | 1998 | 74.8 | 1997 | 75.05 | 1996 | 74.8 | 1995 | 73.06 | 1994 | 72.62 | 1993 | 73.33 | 1992 | 74.44 | 1991 | 74.6 | 1990 | 74.6 | 1989 | 75.18 | 1988 | 75.22 | 1987 | 75.19 | 1986 | 75.14 | 1985 | 74.06 | 1984 | 74.5 | 1983 | 74.62 | 1982 | 74.65 | 1981 | 74.4 | 1980 | 74.12 | 1979 | 73.72 | 1978 | 74.12 | 1977 | 74.16 | 1976 | 74.39 | 1975 | 74.16 | 1974 | 74.74 | 1973 | 74.5 | 1972 | 74.76 | 1971 | 74.8 | 1970 | 74.23 | 1969 | 74.55 | 1968 | 74.54 | 1967 | 74.22 | 1966 | 74.6 | 1965 | 74.86 | 1964 | 74.89 | 1963 | 73.65 | 1962 | 73.19 | 1961 | 73.92 | 1960 | 73.49 |
|