Year | Value | 2022 | 56.873 | 2021 | 56.651 | 2020 | 56.446 | 2019 | 56.26 | 2018 | 56.092 | 2017 | 55.942 | 2016 | 55.81 | 2015 | 55.696 | 2014 | 55.583 | 2013 | 55.469 | 2012 | 55.356 | 2011 | 55.215 | 2010 | 54.993 | 2009 | 54.772 | 2008 | 54.55 | 2007 | 54.328 | 2006 | 54.105 | 2005 | 53.883 | 2004 | 53.661 | 2003 | 53.437 | 2002 | 53.215 | 2001 | 52.992 | 2000 | 52.769 | 1999 | 52.545 | 1998 | 52.322 | 1997 | 52.098 | 1996 | 51.875 | 1995 | 51.651 | 1994 | 51.428 | 1993 | 51.204 | 1992 | 50.981 | 1991 | 50.756 | 1990 | 50.393 | 1989 | 49.982 | 1988 | 49.573 | 1987 | 49.161 | 1986 | 48.751 | 1985 | 48.341 | 1984 | 47.932 | 1983 | 47.521 | 1982 | 47.112 | 1981 | 46.703 | 1980 | 46.146 | 1979 | 45.539 | 1978 | 44.934 | 1977 | 44.33 | 1976 | 43.729 | 1975 | 43.128 | 1974 | 42.53 | 1973 | 41.933 | 1972 | 41.341 | 1971 | 40.749 | 1970 | 39.744 | 1969 | 38.609 | 1968 | 37.488 | 1967 | 36.377 | 1966 | 35.282 | 1965 | 34.202 | 1964 | 33.14 | 1963 | 32.091 | 1962 | 31.062 | 1961 | 30.052 | 1960 | 29.064 |
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