Year | Value | 2021 | 63.798 | 2020 | 64.358 | 2019 | 64.18 | 2018 | 64.013 | 2017 | 63.556 | 2016 | 63.33 | 2015 | 63.219 | 2014 | 62.764 | 2013 | 62.571 | 2012 | 61.946 | 2011 | 61.247 | 2010 | 60.738 | 2009 | 60.349 | 2008 | 59.582 | 2007 | 58.628 | 2006 | 57.491 | 2005 | 56.316 | 2004 | 54.666 | 2003 | 52.672 | 2002 | 50.124 | 2001 | 47.849 | 2000 | 45.902 | 1999 | 43.38 | 1998 | 39.662 | 1997 | 38.784 | 1996 | 39.2 | 1995 | 38.147 | 1994 | 13.071 | 1993 | 39.888 | 1992 | 42.12 | 1991 | 44.454 | 1990 | 46.517 | 1989 | 48.763 | 1988 | 49.355 | 1987 | 49.589 | 1986 | 49.933 | 1985 | 50.097 | 1984 | 50.134 | 1983 | 49.899 | 1982 | 49.372 | 1981 | 48.132 | 1980 | 46.748 | 1979 | 45.547 | 1978 | 44.61 | 1977 | 44.107 | 1976 | 44.118 | 1975 | 44.406 | 1974 | 44.992 | 1973 | 45.595 | 1972 | 46.069 | 1971 | 46.389 | 1970 | 46.704 | 1969 | 46.938 | 1968 | 47.238 | 1967 | 47.574 | 1966 | 47.631 | 1965 | 47.743 | 1964 | 47.626 | 1963 | 42.856 | 1962 | 47.451 | 1961 | 47.101 | 1960 | 46.612 |
|