Year | Value | 2022 | 49.410900717489 | 2021 | 49.38969991523 | 2020 | 49.363463921492 | 2019 | 49.327565763914 | 2018 | 49.289969642563 | 2017 | 49.252390687013 | 2016 | 49.216910097487 | 2015 | 49.178582760439 | 2014 | 49.140405465895 | 2013 | 49.107347510735 | 2012 | 49.076999211052 | 2011 | 49.049042132514 | 2010 | 49.023524383783 | 2009 | 49.00143093145 | 2008 | 48.982046322472 | 2007 | 48.96492738624 | 2006 | 48.951310949898 | 2005 | 48.939923616841 | 2004 | 48.930157267059 | 2003 | 48.920466616359 | 2002 | 48.911252381328 | 2001 | 48.905357370634 | 2000 | 48.900996391099 | 1999 | 48.897930600085 | 1998 | 48.894699121699 | 1997 | 48.890946138957 | 1996 | 48.889114332986 | 1995 | 48.889432381614 | 1994 | 48.888509513484 | 1993 | 48.885813230094 | 1992 | 48.883731819291 | 1991 | 48.880442412039 | 1990 | 48.876837932599 | 1989 | 48.873351266004 | 1988 | 48.870835284753 | 1987 | 48.869272716235 | 1986 | 48.865173954003 | 1985 | 48.863310424315 | 1984 | 48.864770701669 | 1983 | 48.863714220964 | 1982 | 48.860854289031 | 1981 | 48.860893462468 | 1980 | 48.864552253915 | 1979 | 48.869156809203 | 1978 | 48.873564494461 | 1977 | 48.879446961607 | 1976 | 48.887460087377 | 1975 | 48.895674983075 | 1974 | 48.90306916612 | 1973 | 48.911634275564 | 1972 | 48.92177539288 | 1971 | 48.930247522474 | 1970 | 48.935393113739 | 1969 | 48.9417645771 | 1968 | 48.949954657965 | 1967 | 48.956877443517 | 1966 | 48.961881405413 | 1965 | 48.966642573533 | 1964 | 48.97202460583 | 1963 | 48.97794744548 | 1962 | 48.985317858117 | 1961 | 48.994461343546 | 1960 | 49.008159650023 |
|