Year | Value | 2021 | 61.521 | 2020 | 61.7 | 2019 | 62.243 | 2018 | 61.767 | 2017 | 61.107 | 2016 | 60.904 | 2015 | 60.254 | 2014 | 60.013 | 2013 | 59.439 | 2012 | 58.81 | 2011 | 58.658 | 2010 | 57.999 | 2009 | 57.463 | 2008 | 56.818 | 2007 | 56.352 | 2006 | 56.081 | 2005 | 55.454 | 2004 | 54.985 | 2003 | 54.597 | 2002 | 54.312 | 2001 | 54.055 | 2000 | 53.81 | 1999 | 53.388 | 1998 | 53.144 | 1997 | 52.626 | 1996 | 51.621 | 1995 | 52.333 | 1994 | 51.554 | 1993 | 51.27 | 1992 | 50.652 | 1991 | 50.181 | 1990 | 49.85 | 1989 | 49.224 | 1988 | 48.843 | 1987 | 48.112 | 1986 | 47.783 | 1985 | 47.389 | 1984 | 47.287 | 1983 | 46.955 | 1982 | 46.776 | 1981 | 46.555 | 1980 | 46.299 | 1979 | 46.167 | 1978 | 45.584 | 1977 | 45.765 | 1976 | 45.627 | 1975 | 45.513 | 1974 | 45.509 | 1973 | 45.19 | 1972 | 44.984 | 1971 | 44.725 | 1970 | 44.419 | 1969 | 44.116 | 1968 | 43.785 | 1967 | 43.498 | 1966 | 43.121 | 1965 | 42.45 | 1964 | 41.863 | 1963 | 42.061 | 1962 | 41.747 | 1961 | 41.743 | 1960 | 41.96 |
|