Year | Value | 2022 | 59.556 | 2021 | 59.277 | 2020 | 59.012 | 2019 | 58.76 | 2018 | 58.522 | 2017 | 58.299 | 2016 | 58.09 | 2015 | 57.895 | 2014 | 57.7 | 2013 | 57.505 | 2012 | 57.309 | 2011 | 57.113 | 2010 | 56.917 | 2009 | 56.721 | 2008 | 56.525 | 2007 | 56.328 | 2006 | 56.132 | 2005 | 55.935 | 2004 | 55.782 | 2003 | 55.633 | 2002 | 55.484 | 2001 | 55.335 | 2000 | 55.185 | 1999 | 55.036 | 1998 | 54.886 | 1997 | 54.737 | 1996 | 54.587 | 1995 | 54.437 | 1994 | 54.183 | 1993 | 53.907 | 1992 | 53.63 | 1991 | 53.352 | 1990 | 53.075 | 1989 | 52.797 | 1988 | 52.519 | 1987 | 52.241 | 1986 | 51.963 | 1985 | 51.684 | 1984 | 51.406 | 1983 | 51.127 | 1982 | 50.849 | 1981 | 50.57 | 1980 | 50.292 | 1979 | 50.013 | 1978 | 49.734 | 1977 | 49.456 | 1976 | 49.177 | 1975 | 48.898 | 1974 | 48.62 | 1973 | 48.341 | 1972 | 48.063 | 1971 | 47.785 | 1970 | 47.03 | 1969 | 46.16 | 1968 | 45.293 | 1967 | 44.427 | 1966 | 43.565 | 1965 | 42.707 | 1964 | 41.855 | 1963 | 41.005 | 1962 | 40.481 | 1961 | 40.03 | 1960 | 39.581 |
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