Year | Value | 2022 | 48.901764768401 | 2021 | 48.869376825564 | 2020 | 48.836820537884 | 2019 | 48.804981828447 | 2018 | 48.772541826636 | 2017 | 48.738705757722 | 2016 | 48.703782332646 | 2015 | 48.669101926036 | 2014 | 48.635796123949 | 2013 | 48.60258769867 | 2012 | 48.567481581049 | 2011 | 48.529846680729 | 2010 | 48.490665923433 | 2009 | 48.504210410075 | 2008 | 48.573713930765 | 2007 | 48.647117862868 | 2006 | 48.723915538982 | 2005 | 48.804067469808 | 2004 | 48.890511350558 | 2003 | 48.983708625884 | 2002 | 49.084175194352 | 2001 | 49.192917647676 | 2000 | 49.307984476022 | 1999 | 49.365596635113 | 1998 | 49.361152969055 | 1997 | 49.35753750098 | 1996 | 49.354960747112 | 1995 | 49.35320194461 | 1994 | 49.351593109559 | 1993 | 49.349947509398 | 1992 | 49.347196490602 | 1991 | 49.343908776507 | 1990 | 49.340419913074 | 1989 | 49.334720630726 | 1988 | 49.327052441037 | 1987 | 49.318394574026 | 1986 | 49.309320677638 | 1985 | 49.300936217475 | 1984 | 49.292817721691 | 1983 | 49.284083201811 | 1982 | 49.275186482264 | 1981 | 49.26551432354 | 1980 | 49.254436406618 | 1979 | 49.242567637418 | 1978 | 49.229816391914 | 1977 | 49.215577410908 | 1976 | 49.204165781912 | 1975 | 49.195619501449 | 1974 | 49.186343374838 | 1973 | 49.176852881006 | 1972 | 49.166601784418 | 1971 | 49.155801764444 | 1970 | 49.144404681004 | 1969 | 49.131874942604 | 1968 | 49.11829463041 | 1967 | 49.104203406231 | 1966 | 49.089316762738 | 1965 | 49.07186391488 | 1964 | 49.052611922351 | 1963 | 49.032747236096 | 1962 | 49.011138343566 | 1961 | 48.986074586321 | 1960 | 48.957144837577 |
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