Year | Value | 2021 | 36.193270173146 | 2020 | 36.422434913272 | 2019 | 36.114468655059 | 2018 | 35.957147989679 | 2017 | 35.621672817532 | 2016 | 35.291812273425 | 2015 | 35.556353897906 | 2014 | 35.690257683138 | 2013 | 35.243786943601 | 2012 | 35.676964274051 | 2011 | 36.240734088757 | 2010 | 35.356536502547 | 2009 | 39.395324539637 | 2008 | 39.317662422462 | 2007 | 38.59689213894 | 2006 | 40.376077304779 | 2005 | 39.633728332191 | 2004 | 41.164756961447 | 2003 | 41.101750261233 | 2002 | 42.476084756277 | 2001 | 44.350125697868 | 2000 | 45.685461490744 | 1999 | 45.94338698619 | 1998 | 45.894413790852 | 1997 | 45.727904926704 | 1996 | 45.721375167325 | 1995 | 46.393940383297 | 1994 | 46.687779555323 | 1993 | 46.704103953769 | 1992 | 46.808580103823 | 1991 | 46.883672336674 | 1990 | 46.975088967972 | 1989 | 47.05997583989 | 1988 | 47.223219824349 | 1987 | 47.275457899376 | 1986 | 47.288517418133 | 1985 | 47.376669169741 | 1984 | 47.455026282282 | 1983 | 47.255868621241 | 1982 | 47.288517418133 | 1981 | 47.37993404943 | 1980 | 47.735805935551 | 1979 | 47.837017205916 | 1978 | 48.023115348199 | 1977 | 48.121061738875 | 1976 | 48.199418851415 | 1975 | 48.258186685821 | 1974 | 48.202683731104 | 1973 | 48.320219399915 | 1972 | 48.463874106239 | 1971 | 48.907897743968 | 1970 | 49.2605047504 | 1969 | 49.312742825427 | 1968 | 49.838388455385 | 1967 | 49.923275327304 | 1966 | 50.396682882236 | 1965 | 50.399947761925 | 1964 | 51.261875999869 | 1963 | 51.366352149923 | 1962 | 51.679780600085 | 1961 | 52.055241764341 |
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