Year | Value | 2021 | 60.045926429189 | 2020 | 60.045862861102 | 2019 | 60.219813365442 | 2018 | 60.243564656144 | 2017 | 60.28393879974 | 2016 | 60.399099956612 | 2015 | 60.431724847722 | 2014 | 60.449550819154 | 2013 | 60.439460646646 | 2012 | 60.420625657963 | 2011 | 60.430043152304 | 2010 | 60.397418261194 | 2009 | 60.563906107581 | 2008 | 60.459304652579 | 2007 | 60.413226198124 | 2006 | 60.509419176037 | 2005 | 60.583413774431 | 2004 | 60.66716220625 | 2003 | 60.624783481715 | 2002 | 60.729384936718 | 2001 | 60.704832183614 | 2000 | 60.868965656416 | 1999 | 60.884437254262 | 1998 | 60.834995408972 | 1997 | 60.870983690918 | 1996 | 60.739138770143 | 1995 | 60.858875483908 | 1994 | 60.975248806837 | 1993 | 61.005855663446 | 1992 | 60.979957554008 | 1991 | 61.074468836502 | 1990 | 61.016282175038 | 1989 | 61.045880014395 | 1988 | 60.907980990115 | 1987 | 61.060006255907 | 1986 | 60.94195123756 | 1985 | 60.991729421934 | 1984 | 61.029399399298 | 1983 | 60.696423706524 | 1982 | 60.80035248336 | 1981 | 60.675907022424 | 1980 | 60.632519280638 | 1979 | 60.73611171839 | 1978 | 60.740147787393 | 1977 | 60.403472364699 | 1976 | 60.422980031549 | 1975 | 60.438115290311 | 1974 | 60.299543587864 | 1973 | 60.120947534466 | 1972 | 59.85019457216 | 1971 | 59.806806830374 | 1970 | 59.885846515023 | 1969 | 59.798398353284 | 1968 | 59.990784309109 | 1967 | 59.803443439538 | 1966 | 59.710277513378 | 1965 | 59.591549816863 | 1964 | 59.435152142984 | 1963 | 59.24747493433 | 1962 | 59.357794153754 | 1961 | 58.84319535583 |
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