Year | Value | 2022 | 47.703319232309 | 2021 | 47.694603319946 | 2020 | 47.714374041117 | 2019 | 47.726537802965 | 2018 | 47.731109114965 | 2017 | 47.735991077784 | 2016 | 47.742121625026 | 2015 | 47.756272634884 | 2014 | 47.788134713891 | 2013 | 47.83124667423 | 2012 | 47.876372536357 | 2011 | 47.923823935726 | 2010 | 48.028735821396 | 2009 | 48.251722712018 | 2008 | 48.548198351439 | 2007 | 48.868065574783 | 2006 | 49.213466016343 | 2005 | 49.455132845391 | 2004 | 49.43865927345 | 2003 | 49.287587370188 | 2002 | 49.138286446495 | 2001 | 48.989223642716 | 2000 | 48.903296376901 | 1999 | 48.942223598197 | 1998 | 49.0470587718 | 1997 | 49.157685282514 | 1996 | 49.274282476835 | 1995 | 49.388254382561 | 1994 | 49.49097208671 | 1993 | 49.589863145749 | 1992 | 49.694275285752 | 1991 | 49.805871910069 | 1990 | 49.868788028889 | 1989 | 49.813677121139 | 1988 | 49.691234589502 | 1987 | 49.567136170917 | 1986 | 49.43970801465 | 1985 | 49.319060280849 | 1984 | 49.226785857177 | 1983 | 49.152810014765 | 1982 | 49.081552110127 | 1981 | 49.012734722778 | 1980 | 48.963960530322 | 1979 | 48.906276701711 | 1978 | 48.831960042199 | 1977 | 48.773474521479 | 1976 | 48.728213353517 | 1975 | 48.690818280569 | 1974 | 48.650133563151 | 1973 | 48.608189680418 | 1972 | 48.564974560945 | 1971 | 48.524404790305 | 1970 | 48.486903145796 | 1969 | 48.530515026307 | 1968 | 48.633127641063 | 1967 | 48.71190488765 | 1966 | 48.815583429391 | 1965 | 48.910032026425 | 1964 | 49.0045129775 | 1963 | 49.139071645307 | 1962 | 49.272582439001 | 1961 | 49.387981893748 | 1960 | 49.654514236961 |
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