Year | Value | 2022 | 49.513201337278 | 2021 | 49.537928196194 | 2020 | 49.56343818668 | 2019 | 49.562991463939 | 2018 | 49.538839546766 | 2017 | 49.51072092029 | 2016 | 49.47746891434 | 2015 | 49.442251808533 | 2014 | 49.405880989621 | 2013 | 49.365874928422 | 2012 | 49.322788392852 | 2011 | 49.27716117029 | 2010 | 49.254921491575 | 2009 | 49.258591808258 | 2008 | 49.262446339064 | 2007 | 49.265173243298 | 2006 | 49.264787248337 | 2005 | 49.259593979531 | 2004 | 49.251351817007 | 2003 | 49.245708372188 | 2002 | 49.248951237261 | 2001 | 49.248569098173 | 2000 | 49.230758100836 | 1999 | 49.198107736198 | 1998 | 49.162842333529 | 1997 | 49.134849681293 | 1996 | 49.111669683887 | 1995 | 49.088697608538 | 1994 | 49.065344890675 | 1993 | 49.043292424814 | 1992 | 49.017863360221 | 1991 | 48.98626109714 | 1990 | 48.955829155295 | 1989 | 48.927305946558 | 1988 | 48.90086011507 | 1987 | 48.879987276216 | 1986 | 48.85938202324 | 1985 | 48.836307280549 | 1984 | 48.815250645411 | 1983 | 48.796479693881 | 1982 | 48.782534764762 | 1981 | 48.775325541747 | 1980 | 48.776150049428 | 1979 | 48.786854889536 | 1978 | 48.807319918677 | 1977 | 48.834724870549 | 1976 | 48.860049350958 | 1975 | 48.883926309434 | 1974 | 48.907045007241 | 1973 | 48.9265627025 | 1972 | 48.934543386352 | 1971 | 48.923373453191 | 1970 | 48.8997852226 | 1969 | 48.893082013838 | 1968 | 48.930838939486 | 1967 | 49.021046994981 | 1966 | 49.147540953696 | 1965 | 49.264735708343 | 1964 | 49.342593316316 | 1963 | 49.395758858713 | 1962 | 49.450620307328 | 1961 | 49.508869636178 | 1960 | 49.561263273264 |
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