Year | Value | 2021 | 77.315 | 2020 | 78.445 | 2019 | 79.01 | 2018 | 78.854 | 2017 | 78.794 | 2016 | 78.486 | 2015 | 78.644 | 2014 | 78.614 | 2013 | 78.803 | 2012 | 78.603 | 2011 | 78.62 | 2010 | 78.612 | 2009 | 77.371 | 2008 | 76.944 | 2007 | 76.478 | 2006 | 76.542 | 2005 | 76.56 | 2004 | 76.45 | 2003 | 76.503 | 2002 | 76.555 | 2001 | 76.495 | 2000 | 76.477 | 1999 | 76.466 | 1998 | 76.378 | 1997 | 76.355 | 1996 | 76.403 | 1995 | 76.36 | 1994 | 76.253 | 1993 | 76.218 | 1992 | 76.181 | 1991 | 76.147 | 1990 | 76.196 | 1989 | 76.147 | 1988 | 76.113 | 1987 | 76.117 | 1986 | 76.139 | 1985 | 76.052 | 1984 | 75.855 | 1983 | 75.707 | 1982 | 75.504 | 1981 | 75.298 | 1980 | 74.83 | 1979 | 74.746 | 1978 | 74.615 | 1977 | 74.525 | 1976 | 74.417 | 1975 | 74.284 | 1974 | 73.909 | 1973 | 73.487 | 1972 | 72.785 | 1971 | 72.006 | 1970 | 71.585 | 1969 | 71.135 | 1968 | 70.673 | 1967 | 70.281 | 1966 | 69.901 | 1965 | 69.449 | 1964 | 69.18 | 1963 | 68.992 | 1962 | 68.579 | 1961 | 68.269 | 1960 | 67.783 |
|