Year | Value | 2021 | 50.374 | 2020 | 51.962 | 2019 | 51.406 | 2018 | 50.992 | 2017 | 50.351 | 2016 | 49.564 | 2015 | 48.48 | 2014 | 47.419 | 2013 | 46.428 | 2012 | 45.36 | 2011 | 44.301 | 2010 | 43.214 | 2009 | 42.069 | 2008 | 41.247 | 2007 | 40.811 | 2006 | 40.689 | 2005 | 41.157 | 2004 | 41.609 | 2003 | 42.525 | 2002 | 43.545 | 2001 | 44.774 | 2000 | 46.07 | 1999 | 47.422 | 1998 | 48.707 | 1997 | 50.273 | 1996 | 51.652 | 1995 | 52.944 | 1994 | 54.106 | 1993 | 54.094 | 1992 | 54.611 | 1991 | 55.33 | 1990 | 55.328 | 1989 | 55.425 | 1988 | 55.328 | 1987 | 55.169 | 1986 | 55.164 | 1985 | 54.846 | 1984 | 54.353 | 1983 | 53.804 | 1982 | 53.264 | 1981 | 52.538 | 1980 | 51.724 | 1979 | 51.032 | 1978 | 50.425 | 1977 | 49.883 | 1976 | 49.354 | 1975 | 48.993 | 1974 | 48.516 | 1973 | 48.136 | 1972 | 47.76 | 1971 | 47.283 | 1970 | 46.996 | 1969 | 46.649 | 1968 | 46.269 | 1967 | 46.119 | 1966 | 46.021 | 1965 | 45.89 | 1964 | 46.074 | 1963 | 46.204 | 1962 | 46.283 | 1961 | 46.306 | 1960 | 46.243 |
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