Year | Value | 2022 | 55.751 | 2021 | 55.427 | 2020 | 55.118 | 2019 | 54.822 | 2018 | 54.541 | 2017 | 54.273 | 2016 | 54.02 | 2015 | 53.781 | 2014 | 53.557 | 2013 | 53.332 | 2012 | 53.108 | 2011 | 52.883 | 2010 | 52.658 | 2009 | 52.433 | 2008 | 52.209 | 2007 | 51.983 | 2006 | 51.758 | 2005 | 51.533 | 2004 | 51.308 | 2003 | 51.082 | 2002 | 50.857 | 2001 | 50.78 | 2000 | 50.754 | 1999 | 50.728 | 1998 | 50.701 | 1997 | 50.675 | 1996 | 50.649 | 1995 | 50.622 | 1994 | 50.596 | 1993 | 50.569 | 1992 | 50.543 | 1991 | 50.517 | 1990 | 50.39 | 1989 | 50.229 | 1988 | 50.068 | 1987 | 49.907 | 1986 | 49.746 | 1985 | 49.584 | 1984 | 49.424 | 1983 | 49.263 | 1982 | 49.102 | 1981 | 48.941 | 1980 | 48.045 | 1979 | 46.901 | 1978 | 45.762 | 1977 | 44.627 | 1976 | 43.499 | 1975 | 42.374 | 1974 | 41.259 | 1973 | 40.153 | 1972 | 39.058 | 1971 | 37.972 | 1970 | 37.004 | 1969 | 36.081 | 1968 | 35.169 | 1967 | 34.266 | 1966 | 33.376 | 1965 | 32.497 | 1964 | 31.631 | 1963 | 30.776 | 1962 | 29.934 | 1961 | 29.107 | 1960 | 28.204 |
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