Year | Value | 2021 | 62.705 | 2020 | 62.851 | 2019 | 62.991 | 2018 | 62.714 | 2017 | 62.115 | 2016 | 61.648 | 2015 | 61.086 | 2014 | 60.408 | 2013 | 59.763 | 2012 | 58.817 | 2011 | 57.965 | 2010 | 57.055 | 2009 | 56.488 | 2008 | 55.823 | 2007 | 55.236 | 2006 | 54.369 | 2005 | 52.976 | 2004 | 51.547 | 2003 | 50.368 | 2002 | 49.648 | 2001 | 49.006 | 2000 | 48.342 | 1999 | 47.786 | 1998 | 47.175 | 1997 | 46.977 | 1996 | 46.67 | 1995 | 46.567 | 1994 | 46.353 | 1993 | 46.237 | 1992 | 46.368 | 1991 | 46.316 | 1990 | 46.443 | 1989 | 46.472 | 1988 | 46.701 | 1987 | 46.619 | 1986 | 45.322 | 1985 | 45.381 | 1984 | 43.752 | 1983 | 43.519 | 1982 | 43.185 | 1981 | 43.09 | 1980 | 42.949 | 1979 | 44.981 | 1978 | 45.207 | 1977 | 45.511 | 1976 | 45.869 | 1975 | 46.267 | 1974 | 46.612 | 1973 | 46.84 | 1972 | 46.967 | 1971 | 46.93 | 1970 | 49.616 | 1969 | 49.511 | 1968 | 49.213 | 1967 | 48.962 | 1966 | 48.338 | 1965 | 48.24 | 1964 | 47.889 | 1963 | 47.431 | 1962 | 46.965 | 1961 | 46.257 | 1960 | 45.506 |
|