Year | Value | 2021 | 69.163594182843 | 2020 | 69.364921100403 | 2019 | 69.29425140877 | 2018 | 69.213748286164 | 2017 | 69.118864892358 | 2016 | 68.827511236894 | 2015 | 68.562208761319 | 2014 | 68.642639894166 | 2013 | 68.625773949461 | 2012 | 68.597091783178 | 2011 | 68.531384516709 | 2010 | 68.395698405641 | 2009 | 68.023612666419 | 2008 | 68.123840384178 | 2007 | 67.965212871911 | 2006 | 67.985733464194 | 2005 | 67.83041239032 | 2004 | 67.688206910061 | 2003 | 67.519699512967 | 2002 | 67.205266108864 | 2001 | 67.412045176864 | 2000 | 67.303948728131 | 1999 | 67.313350796518 | 1998 | 67.237186626536 | 1997 | 67.037472504599 | 1996 | 66.908568248444 | 1995 | 66.731398698169 | 1994 | 66.479686415389 | 1993 | 66.272834450881 | 1992 | 66.091306806729 | 1991 | 65.879555462782 | 1990 | 65.703012320386 | 1989 | 65.427538875239 | 1988 | 65.259444933059 | 1987 | 64.920319465712 | 1986 | 64.635597307286 | 1985 | 64.520045279563 | 1984 | 64.096595807426 | 1983 | 63.655520480606 | 1982 | 63.244338102661 | 1981 | 63.041174429543 | 1980 | 62.849976279129 | 1979 | 62.740660796801 | 1978 | 62.360448271959 | 1977 | 61.911104942702 | 1976 | 61.660453607951 | 1975 | 61.045945070891 | 1974 | 61.012167654413 | 1973 | 60.429496655343 | 1972 | 60.46180396729 | 1971 | 60.192778429163 | 1970 | 59.823680022366 | 1969 | 59.410395997814 | 1968 | 59.168299694827 | 1967 | 58.72037442107 | 1966 | 58.178906256486 | 1965 | 57.706479532327 | 1964 | 56.661139689728 | 1963 | 56.451815243013 | 1962 | 55.831918568571 | 1961 | 55.141455142104 | 1960 | 54.535021305872 |
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