Year | Value | 2022 | 53.300261381348 | 2021 | 53.729045551125 | 2020 | 54.133993973383 | 2019 | 54.533592420165 | 2018 | 54.939286979155 | 2017 | 55.338519035849 | 2016 | 55.732092758423 | 2015 | 56.133379201023 | 2014 | 56.543701173428 | 2013 | 56.934678285638 | 2012 | 57.307122182042 | 2011 | 57.665649488147 | 2010 | 58.028457268417 | 2009 | 58.406860418814 | 2008 | 58.790833865538 | 2007 | 59.174910349373 | 2006 | 59.554940250834 | 2005 | 59.934723859291 | 2004 | 60.301152682584 | 2003 | 60.65905468693 | 2002 | 61.010882508787 | 2001 | 61.364933858347 | 2000 | 61.687537912754 | 1999 | 62.020644956686 | 1998 | 62.352377478295 | 1997 | 62.687431445565 | 1996 | 63.016859574613 | 1995 | 63.346218291337 | 1994 | 63.702847931717 | 1993 | 64.057542184286 | 1992 | 64.393254551014 | 1991 | 64.742905000314 | 1990 | 65.118957433127 | 1989 | 65.569380623773 | 1988 | 65.981453427859 | 1987 | 66.391160378489 | 1986 | 66.803914930178 | 1985 | 67.230512172686 | 1984 | 67.658603070822 | 1983 | 68.082552725857 | 1982 | 68.498017707195 | 1981 | 68.907828890344 | 1980 | 69.39377240199 | 1979 | 69.876306708071 | 1978 | 70.341271066279 | 1977 | 70.804887493946 | 1976 | 71.263287825873 | 1975 | 71.722143093136 | 1974 | 72.052966439998 | 1973 | 72.498646636771 | 1972 | 72.937941051858 | 1971 | 73.381714364511 | 1970 | 73.770637096694 | 1969 | 74.128565093464 | 1968 | 74.480537921226 | 1967 | 74.830614481504 | 1966 | 75.184003210492 | 1965 | 75.533834914933 | 1964 | 75.875879650561 | 1963 | 76.211375678592 | 1962 | 76.540648380732 | 1961 | 76.865233517741 | 1960 | 77.153221186862 |
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