Year | Value | 2022 | 49.654822651879 | 2021 | 49.642003852539 | 2020 | 49.622846483632 | 2019 | 49.606951406644 | 2018 | 49.601793169765 | 2017 | 49.607931311547 | 2016 | 49.627167239337 | 2015 | 49.662635584299 | 2014 | 49.705088446623 | 2013 | 49.742559877036 | 2012 | 49.763280992451 | 2011 | 49.771830198943 | 2010 | 49.780650204404 | 2009 | 49.777423755217 | 2008 | 49.747242935799 | 2007 | 49.70421242977 | 2006 | 49.670357643488 | 2005 | 49.650528256598 | 2004 | 49.63789813188 | 2003 | 49.629080137524 | 2002 | 49.622383502353 | 2001 | 49.61745140817 | 2000 | 49.624957204933 | 1999 | 49.643947744607 | 1998 | 49.667048657521 | 1997 | 49.695533737999 | 1996 | 49.727992962822 | 1995 | 49.754876951335 | 1994 | 49.77348015535 | 1993 | 49.79269785783 | 1992 | 49.815547644255 | 1991 | 49.842123419454 | 1990 | 49.868028530966 | 1989 | 49.884411048244 | 1988 | 49.899518350071 | 1987 | 49.921770679568 | 1986 | 49.937632316259 | 1985 | 49.934687649225 | 1984 | 49.927911567757 | 1983 | 49.926880683681 | 1982 | 49.919724797103 | 1981 | 49.915090717702 | 1980 | 49.930839267629 | 1979 | 49.964343580643 | 1978 | 50.005105945229 | 1977 | 50.051851692675 | 1976 | 50.100818687922 | 1975 | 50.148428146505 | 1974 | 50.187218505011 | 1973 | 50.212013067405 | 1972 | 50.230829240947 | 1971 | 50.253843476837 | 1970 | 50.28192063634 | 1969 | 50.301519788849 | 1968 | 50.312348729079 | 1967 | 50.326663059282 | 1966 | 50.347447849612 | 1965 | 50.368090263589 | 1964 | 50.386148130068 | 1963 | 50.410671063328 | 1962 | 50.457102032209 | 1961 | 50.508702792649 | 1960 | 50.520592375728 |
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