Year | Value | 2022 | 0.95327892285454 | 2021 | 0.52349050816876 | 2020 | 0.55554079025497 | 2019 | 0.65507157480522 | 2018 | 0.58393340892083 | 2017 | 0.59120336616412 | 2016 | 0.53217887960849 | 2015 | 0.44322008903577 | 2014 | 0.35982817272655 | 2013 | 0.29482079344148 | 2012 | 0.37005503477023 | 2011 | 0.46642878220082 | 2010 | 0.51292310055359 | 2009 | 0.51428454482776 | 2008 | 0.38929246149953 | 2007 | 0.21752160119424 | 2006 | 0.16061366885754 | 2005 | 0.23366314793854 | 2004 | 0.34747541204866 | 2003 | 0.47181439878821 | 2002 | 0.63829166626853 | 2001 | 0.7548400577349 | 2000 | 0.71477036278439 | 1999 | 0.66549318707314 | 1998 | 0.61664053067966 | 1997 | 0.51476700211746 | 1996 | 0.46139574760771 | 1995 | 0.49392737251493 | 1994 | 0.60293847427419 | 1993 | 0.69699133012514 | 1992 | 0.75605659339679 | 1991 | 0.78803103537514 | 1990 | 0.6886038234388 | 1989 | 0.59990721305618 | 1988 | 0.64609622755224 | 1987 | 0.63452687926415 | 1986 | 0.55495772576065 | 1985 | 0.46632651988243 | 1984 | 0.39693318976803 | 1983 | 0.37922259579425 | 1982 | 0.45855986421728 | 1981 | 0.68604679796041 | 1980 | 0.79133180814233 | 1979 | 0.69028225158705 | 1978 | 0.6152645768869 | 1977 | 0.59462600082616 | 1976 | 0.78499338902785 | 1975 | 0.89138995535984 | 1974 | 0.78367225014689 | 1973 | 0.82733101621377 | 1972 | 1.0111728503337 | 1971 | 1.1891335428944 | 1970 | 1.2389326613278 | 1969 | 1.157969108926 | 1968 | 1.0385469611074 | 1967 | 1.1331440725989 | 1966 | 1.305170730801 | 1965 | 1.3726611051235 | 1964 | 1.3377813320821 | 1963 | 1.3484919646048 | 1962 | 1.4244750673991 | 1961 | 1.3152945882323 |
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