Year | Value | 2021 | 71.246 | 2020 | 72.102 | 2019 | 73.379 | 2018 | 73.519 | 2017 | 73.27 | 2016 | 73.06 | 2015 | 72.67 | 2014 | 72.383 | 2013 | 71.905 | 2012 | 71.641 | 2011 | 71.191 | 2010 | 70.631 | 2009 | 70.543 | 2008 | 70.492 | 2007 | 70.381 | 2006 | 69.847 | 2005 | 69.513 | 2004 | 69.047 | 2003 | 67.61 | 2002 | 68.173 | 2001 | 67.591 | 2000 | 67.337 | 1999 | 66.925 | 1998 | 66.472 | 1997 | 66.031 | 1996 | 65.692 | 1995 | 65.743 | 1994 | 65.346 | 1993 | 65.167 | 1992 | 64.722 | 1991 | 64.537 | 1990 | 62.611 | 1989 | 63.91 | 1988 | 60.453 | 1987 | 59.9 | 1986 | 59.574 | 1985 | 59.021 | 1984 | 58.456 | 1983 | 54.882 | 1982 | 53.965 | 1981 | 52.959 | 1980 | 56.704 | 1979 | 57.489 | 1978 | 55.242 | 1977 | 55.873 | 1976 | 55.165 | 1975 | 54.332 | 1974 | 53.454 | 1973 | 52.666 | 1972 | 51.701 | 1971 | 51.147 | 1970 | 50.311 | 1969 | 49.692 | 1968 | 48.465 | 1967 | 48.505 | 1966 | 47.879 | 1965 | 47.381 | 1964 | 46.857 | 1963 | 46.28 | 1962 | 45.097 | 1961 | 45.382 | 1960 | 44.802 |
|