Year | Value | 2021 | 69.266 | 2020 | 72.119 | 2019 | 71.865 | 2018 | 71.689 | 2017 | 71.516 | 2016 | 71.387 | 2015 | 71.268 | 2014 | 71.151 | 2013 | 70.835 | 2012 | 70.881 | 2011 | 70.788 | 2010 | 70.754 | 2009 | 70.633 | 2008 | 70.564 | 2007 | 70.483 | 2006 | 70.282 | 2005 | 70.24 | 2004 | 70.037 | 2003 | 69.924 | 2002 | 69.781 | 2001 | 69.614 | 2000 | 69.413 | 1999 | 69.298 | 1998 | 69.1 | 1997 | 68.884 | 1996 | 68.614 | 1995 | 68.223 | 1994 | 67.942 | 1993 | 67.542 | 1992 | 67.088 | 1991 | 66.304 | 1990 | 65.909 | 1989 | 65.464 | 1988 | 64.898 | 1987 | 64.335 | 1986 | 63.745 | 1985 | 63.505 | 1984 | 63.112 | 1983 | 62.992 | 1982 | 62.784 | 1981 | 62.555 | 1980 | 62.499 | 1979 | 62.349 | 1978 | 62.185 | 1977 | 62.149 | 1976 | 61.614 | 1975 | 61.704 | 1974 | 61.68 | 1973 | 61.641 | 1972 | 61.831 | 1971 | 61.988 | 1970 | 61.692 | 1969 | 61.798 | 1968 | 61.65 | 1967 | 61.447 | 1966 | 61.198 | 1965 | 60.898 | 1964 | 60.541 | 1963 | 60.388 | 1962 | 59.959 | 1961 | 59.619 | 1960 | 59.227 |
|