Year | Value | 2021 | 73.503663747589 | 2020 | 73.841957401687 | 2019 | 75.111012699417 | 2018 | 74.811393562589 | 2017 | 74.677934758386 | 2016 | 74.378186240581 | 2015 | 74.034653905056 | 2014 | 74.023674064481 | 2013 | 73.704907695042 | 2012 | 73.328027767502 | 2011 | 73.062857247991 | 2010 | 72.580176377234 | 2009 | 72.241962526917 | 2008 | 71.790212464803 | 2007 | 71.461084254712 | 2006 | 71.050596326323 | 2005 | 70.491071559283 | 2004 | 70.330904306284 | 2003 | 69.901207550065 | 2002 | 69.748114143069 | 2001 | 69.599393065634 | 2000 | 69.300934016294 | 1999 | 69.080798589143 | 1998 | 69.138672738134 | 1997 | 68.77280232599 | 1996 | 68.26560225078 | 1995 | 67.727081041907 | 1994 | 67.579684308037 | 1993 | 67.540824901652 | 1992 | 68.056420154025 | 1991 | 68.382426854383 | 1990 | 68.451485798169 | 1989 | 68.534754628977 | 1988 | 68.485315229676 | 1987 | 68.422292352603 | 1986 | 68.208821362757 | 1985 | 67.523881372493 | 1984 | 67.233514384715 | 1983 | 67.125449806173 | 1982 | 67.080993697462 | 1981 | 66.754630402309 | 1980 | 66.461254468956 | 1979 | 66.341746754883 | 1978 | 66.261431611298 | 1977 | 66.208227495758 | 1976 | 66.10130225301 | 1975 | 65.989194435814 | 1974 | 66.092779861601 | 1973 | 65.936524971275 | 1972 | 65.822730801909 | 1971 | 65.585908023095 | 1970 | 65.438852538577 | 1969 | 65.021209854447 | 1968 | 65.303238755656 | 1967 | 65.391649637189 | 1966 | 65.433208702101 | 1965 | 65.306076191188 | 1964 | 65.349704174453 | 1963 | 64.862607643339 | 1962 | 64.564888082948 | 1961 | 64.722842651777 | 1960 | 64.488366366941 |
|