Year | Value | 2021 | 63.787 | 2020 | 63.945 | 2019 | 64.595 | 2018 | 64.222 | 2017 | 64.02 | 2016 | 63.684 | 2015 | 63.502 | 2014 | 63.129 | 2013 | 62.979 | 2012 | 62.666 | 2011 | 62.539 | 2010 | 62.309 | 2009 | 62.073 | 2008 | 61.922 | 2007 | 61.919 | 2006 | 62.076 | 2005 | 61.171 | 2004 | 61.881 | 2003 | 61.874 | 2002 | 61.749 | 2001 | 61.441 | 2000 | 61.237 | 1999 | 60.774 | 1998 | 60.237 | 1997 | 59.874 | 1996 | 59.859 | 1995 | 59.473 | 1994 | 59.711 | 1993 | 59.601 | 1992 | 59.626 | 1991 | 59.393 | 1990 | 58.984 | 1989 | 58.73 | 1988 | 58.542 | 1987 | 58.507 | 1986 | 58.844 | 1985 | 58.545 | 1984 | 58.028 | 1983 | 57.748 | 1982 | 57.353 | 1981 | 57.102 | 1980 | 56.829 | 1979 | 56.453 | 1978 | 56.267 | 1977 | 55.829 | 1976 | 55.85 | 1975 | 55.75 | 1974 | 55.427 | 1973 | 55.502 | 1972 | 55.378 | 1971 | 48.983 | 1970 | 54.971 | 1969 | 54.189 | 1968 | 53.456 | 1967 | 52.561 | 1966 | 51.612 | 1965 | 50.307 | 1964 | 49.673 | 1963 | 48.772 | 1962 | 47.992 | 1961 | 47.164 | 1960 | 46.282 |
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