Year | Value | 2021 | 67.172 | 2020 | 70.244 | 2019 | 69.986 | 2018 | 69.815 | 2017 | 69.667 | 2016 | 69.571 | 2015 | 69.486 | 2014 | 69.407 | 2013 | 69.16 | 2012 | 69.191 | 2011 | 69.112 | 2010 | 69.064 | 2009 | 68.949 | 2008 | 68.883 | 2007 | 68.794 | 2006 | 68.612 | 2005 | 68.54 | 2004 | 68.344 | 2003 | 68.189 | 2002 | 68.052 | 2001 | 67.865 | 2000 | 67.638 | 1999 | 67.533 | 1998 | 67.346 | 1997 | 67.141 | 1996 | 66.905 | 1995 | 66.562 | 1994 | 66.234 | 1993 | 65.788 | 1992 | 65.286 | 1991 | 64.527 | 1990 | 64.146 | 1989 | 63.726 | 1988 | 63.148 | 1987 | 62.547 | 1986 | 61.909 | 1985 | 61.751 | 1984 | 61.405 | 1983 | 61.258 | 1982 | 61.051 | 1981 | 60.808 | 1980 | 60.763 | 1979 | 60.627 | 1978 | 60.454 | 1977 | 60.45 | 1976 | 59.93 | 1975 | 59.913 | 1974 | 59.878 | 1973 | 59.834 | 1972 | 60.1 | 1971 | 60.306 | 1970 | 60.053 | 1969 | 60.143 | 1968 | 60.061 | 1967 | 59.872 | 1966 | 59.648 | 1965 | 59.375 | 1964 | 59.042 | 1963 | 58.888 | 1962 | 58.476 | 1961 | 58.136 | 1960 | 57.751 |
|