Year | Value | 2021 | 59.27 | 2020 | 59.731 | 2019 | 60.039 | 2018 | 60.047 | 2017 | 59.536 | 2016 | 59.326 | 2015 | 58.845 | 2014 | 58.359 | 2013 | 57.823 | 2012 | 57.619 | 2011 | 57.125 | 2010 | 56.477 | 2009 | 55.959 | 2008 | 55.342 | 2007 | 54.375 | 2006 | 53.742 | 2005 | 53.092 | 2004 | 52.416 | 2003 | 51.793 | 2002 | 51.272 | 2001 | 51.071 | 2000 | 50.847 | 1999 | 50.325 | 1998 | 49.991 | 1997 | 49.4 | 1996 | 49.614 | 1995 | 49.446 | 1994 | 49.307 | 1993 | 49.209 | 1992 | 49.437 | 1991 | 49.45 | 1990 | 49.44 | 1989 | 49.174 | 1988 | 49.132 | 1987 | 49.058 | 1986 | 49.013 | 1985 | 48.949 | 1984 | 48.638 | 1983 | 48.091 | 1982 | 47.602 | 1981 | 46.872 | 1980 | 46.539 | 1979 | 45.903 | 1978 | 45.073 | 1977 | 44.147 | 1976 | 43.245 | 1975 | 42.307 | 1974 | 41.354 | 1973 | 40.548 | 1972 | 40.053 | 1971 | 39.559 | 1970 | 39.239 | 1969 | 38.857 | 1968 | 38.531 | 1967 | 38.294 | 1966 | 37.916 | 1965 | 37.691 | 1964 | 37.251 | 1963 | 36.974 | 1962 | 36.665 | 1961 | 36.24 | 1960 | 35.872 |
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