Year | Value | 2021 | 64.752 | 2020 | 65.587 | 2019 | 65.947 | 2018 | 65.78 | 2017 | 65.295 | 2016 | 65.073 | 2015 | 64.549 | 2014 | 64.367 | 2013 | 63.803 | 2012 | 63.357 | 2011 | 63.255 | 2010 | 62.805 | 2009 | 62.236 | 2008 | 61.755 | 2007 | 61.14 | 2006 | 60.451 | 2005 | 59.694 | 2004 | 58.86 | 2003 | 57.857 | 2002 | 57.165 | 2001 | 56.36 | 2000 | 55.758 | 1999 | 55.348 | 1998 | 54.908 | 1997 | 54.979 | 1996 | 55.089 | 1995 | 55.148 | 1994 | 55.176 | 1993 | 55.041 | 1992 | 55.079 | 1991 | 55.045 | 1990 | 54.75 | 1989 | 54.291 | 1988 | 53.716 | 1987 | 52.936 | 1986 | 52.076 | 1985 | 51.027 | 1984 | 50.366 | 1983 | 49.655 | 1982 | 49.187 | 1981 | 48.513 | 1980 | 47.913 | 1979 | 47.102 | 1978 | 46.221 | 1977 | 45.333 | 1976 | 44.423 | 1975 | 43.543 | 1974 | 42.748 | 1973 | 42.188 | 1972 | 41.413 | 1971 | 40.897 | 1970 | 40.558 | 1969 | 40.313 | 1968 | 40.102 | 1967 | 39.895 | 1966 | 39.741 | 1965 | 39.708 | 1964 | 39.672 | 1963 | 39.696 | 1962 | 39.793 | 1961 | 39.791 | 1960 | 39.763 |
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