Year | Value | 2021 | 63.417 | 2020 | 64.166 | 2019 | 64.068 | 2018 | 63.912 | 2017 | 63.625 | 2016 | 63.237 | 2015 | 62.896 | 2014 | 62.516 | 2013 | 62.224 | 2012 | 61.834 | 2011 | 61.503 | 2010 | 61.123 | 2009 | 60.831 | 2008 | 60.475 | 2007 | 60.102 | 2006 | 59.875 | 2005 | 59.604 | 2004 | 59.48 | 2003 | 59.258 | 2002 | 59.056 | 2001 | 59.163 | 2000 | 58.757 | 1999 | 58.781 | 1998 | 58.407 | 1997 | 58.39 | 1996 | 58.344 | 1995 | 58.015 | 1994 | 57.694 | 1993 | 57.276 | 1992 | 56.733 | 1991 | 56.194 | 1990 | 55.84 | 1989 | 55.224 | 1988 | 54.95 | 1987 | 54.368 | 1986 | 54.029 | 1985 | 53.482 | 1984 | 52.941 | 1983 | 52.273 | 1982 | 51.895 | 1981 | 51.312 | 1980 | 50.8 | 1979 | 50.251 | 1978 | 49.67 | 1977 | 49.047 | 1976 | 48.523 | 1975 | 46.628 | 1974 | 47.474 | 1973 | 46.881 | 1972 | 46.305 | 1971 | 45.581 | 1970 | 44.863 | 1969 | 44.158 | 1968 | 43.462 | 1967 | 42.754 | 1966 | 42.147 | 1965 | 41.7 | 1964 | 41.25 | 1963 | 40.926 | 1962 | 40.58 | 1961 | 40.147 | 1960 | 39.694 |
|