Year | Value | 2022 | 50.106341398747 | 2021 | 50.122180421834 | 2020 | 50.141042726014 | 2019 | 50.164457638079 | 2018 | 50.188625769345 | 2017 | 50.214010070737 | 2016 | 50.225279547778 | 2015 | 50.219795951224 | 2014 | 50.203071584703 | 2013 | 50.181606121173 | 2012 | 50.164704465244 | 2011 | 50.14448067198 | 2010 | 50.123663732836 | 2009 | 50.101323332473 | 2008 | 50.078580809059 | 2007 | 50.052395479357 | 2006 | 50.01667738062 | 2005 | 49.971351462629 | 2004 | 49.910046602363 | 2003 | 49.83245621552 | 2002 | 49.751774142571 | 2001 | 49.678366900118 | 2000 | 49.634930957587 | 1999 | 49.617242450778 | 1998 | 49.600598864489 | 1997 | 49.604332376959 | 1996 | 49.628913815321 | 1995 | 49.654041104873 | 1994 | 49.680895559892 | 1993 | 49.707588511618 | 1992 | 49.734047503917 | 1991 | 49.763037242037 | 1990 | 49.793538481669 | 1989 | 49.823501748817 | 1988 | 49.85218433052 | 1987 | 49.88154705505 | 1986 | 49.913252436536 | 1985 | 49.946709722515 | 1984 | 49.98103559395 | 1983 | 50.016395486566 | 1982 | 50.053263496815 | 1981 | 50.09191698157 | 1980 | 50.132015244699 | 1979 | 50.172515584451 | 1978 | 50.213190522246 | 1977 | 50.25405231197 | 1976 | 50.294062708267 | 1975 | 50.331089668008 | 1974 | 50.3654424318 | 1973 | 50.047808305009 | 1972 | 49.702918367469 | 1971 | 49.691677492721 | 1970 | 49.676947992427 | 1969 | 49.659400239474 | 1968 | 49.638305845408 | 1967 | 49.586101813239 | 1966 | 49.530687619092 | 1965 | 49.498266024795 | 1964 | 49.461223224288 | 1963 | 49.419243008717 | 1962 | 49.372696984136 | 1961 | 49.320678433086 | 1960 | 49.261623218313 |
|