Year | Value | 2021 | 53.895 | 2020 | 54.604 | 2019 | 55.025 | 2018 | 54.369 | 2017 | 53.721 | 2016 | 53.46 | 2015 | 52.793 | 2014 | 50.566 | 2013 | 50.902 | 2012 | 50.686 | 2011 | 49.948 | 2010 | 49.255 | 2009 | 48.648 | 2008 | 48.016 | 2007 | 47.426 | 2006 | 46.851 | 2005 | 46.433 | 2004 | 46.038 | 2003 | 45.76 | 2002 | 45.409 | 2001 | 45.393 | 2000 | 45.406 | 1999 | 45.75 | 1998 | 46.025 | 1997 | 46.319 | 1996 | 46.831 | 1995 | 47.35 | 1994 | 47.853 | 1993 | 48.353 | 1992 | 48.793 | 1991 | 49.252 | 1990 | 49.635 | 1989 | 49.986 | 1988 | 50.241 | 1987 | 50.409 | 1986 | 50.492 | 1985 | 50.518 | 1984 | 50.484 | 1983 | 50.423 | 1982 | 50.303 | 1981 | 50.159 | 1980 | 49.889 | 1979 | 49.597 | 1978 | 49.239 | 1977 | 48.838 | 1976 | 48.395 | 1975 | 47.913 | 1974 | 47.402 | 1973 | 46.854 | 1972 | 46.294 | 1971 | 45.688 | 1970 | 45.072 | 1969 | 44.442 | 1968 | 43.797 | 1967 | 43.158 | 1966 | 42.531 | 1965 | 41.929 | 1964 | 41.345 | 1963 | 40.781 | 1962 | 40.256 | 1961 | 39.737 | 1960 | 39.236 |
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