Year | Value | 2022 | 49.594040194611 | 2021 | 49.628739266774 | 2020 | 49.663862357653 | 2019 | 49.686891904852 | 2018 | 49.694610382899 | 2017 | 49.695836280656 | 2016 | 49.698156990053 | 2015 | 49.705421942971 | 2014 | 49.71743023946 | 2013 | 49.736411363466 | 2012 | 49.765018627686 | 2011 | 49.80243722708 | 2010 | 49.819168775809 | 2009 | 49.805434630573 | 2008 | 49.786190523739 | 2007 | 49.768483249624 | 2006 | 49.754343064308 | 2005 | 49.7439293857 | 2004 | 49.734490330578 | 2003 | 49.72330112134 | 2002 | 49.705024859527 | 2001 | 49.672753509361 | 2000 | 49.627597788476 | 1999 | 49.612145499587 | 1998 | 49.632870825413 | 1997 | 49.655529435869 | 1996 | 49.676606140007 | 1995 | 49.693863626416 | 1994 | 49.709886118244 | 1993 | 49.725830513969 | 1992 | 49.741559780621 | 1991 | 49.757213042998 | 1990 | 49.77165611888 | 1989 | 49.783362606533 | 1988 | 49.806367241127 | 1987 | 49.840613563578 | 1986 | 49.870907939035 | 1985 | 49.896184074543 | 1984 | 49.916223742448 | 1983 | 49.933261144732 | 1982 | 49.949573380132 | 1981 | 49.967657934213 | 1980 | 49.987513105349 | 1979 | 50.008205385629 | 1978 | 50.02351677241 | 1977 | 50.022829656423 | 1976 | 50.007847835698 | 1975 | 49.986975757409 | 1974 | 49.963204978068 | 1973 | 49.939991827764 | 1972 | 49.924367683774 | 1971 | 49.919903960066 | 1970 | 49.927118434476 | 1969 | 49.947023782637 | 1968 | 49.973911050499 | 1967 | 49.996119169051 | 1966 | 50.008578197995 | 1965 | 50.015342941189 | 1964 | 50.024048542731 | 1963 | 50.040710557233 | 1962 | 49.990003013446 | 1961 | 49.856846550971 | 1960 | 49.70544113271 |
|