Year | Value | 2021 | 55.267243041858 | 2020 | 53.875439403901 | 2019 | 57.834757834758 | 2018 | 58.031996493535 | 2017 | 58.108700416393 | 2016 | 57.878588647819 | 2015 | 57.681349989042 | 2014 | 57.681349989042 | 2013 | 58.069148348614 | 2012 | 58.963879377002 | 2011 | 58.952833314923 | 2010 | 59.019109687396 | 2009 | 63.879377002099 | 2008 | 64.613324405758 | 2007 | 64.803035375516 | 2006 | 64.825354313135 | 2005 | 65.427965628836 | 2004 | 65.431823253738 | 2003 | 65.442981477349 | 2002 | 65.264449899576 | 2001 | 65.442981477349 | 2000 | 65.32024101763 | 1999 | 68.886414253898 | 1998 | 68.964365256125 | 1997 | 68.986636971047 | 1996 | 68.818161584687 | 1995 | 68.762519474738 | 1994 | 68.128199421322 | 1993 | 68.21722679724 | 1992 | 68.276399243352 | 1991 | 71.881606765328 | 1990 | 72.037387337265 | 1989 | 72.148659174363 | 1988 | 72.29331256259 | 1987 | 72.441032487762 | 1986 | 72.574543836226 | 1985 | 72.752558967512 | 1984 | 72.919448153093 | 1983 | 73.108589230085 | 1982 | 73.222827900768 | 1981 | 73.426028921023 | 1980 | 73.707040373707 | 1979 | 73.965747330961 | 1978 | 74.447037901523 | 1977 | 74.799911071587 | 1976 | 75.119510839355 | 1975 | 75.247304657108 | 1974 | 75.380682449706 | 1973 | 75.969767700345 | 1972 | 76.092030676892 | 1971 | 76.19206402134 | 1970 | 76.40586797066 | 1969 | 76.541837981998 | 1968 | 76.708523169241 | 1967 | 76.822222222222 | 1966 | 76.958115764915 | 1965 | 77.238391468562 | 1964 | 77.518604909475 | 1963 | 77.574141952682 | 1962 | 77.893801377472 | 1961 | 78.665037760995 |
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