Year | Value | 2022 | 73.003784038939 | 2021 | 71.385478721199 | 2020 | 72.224118834338 | 2019 | 72.193482647354 | 2018 | 71.982558053158 | 2017 | 71.948848541241 | 2016 | 72.655690743092 | 2015 | 72.661804651409 | 2014 | 73.011276102247 | 2013 | 74.187774556708 | 2012 | 74.18382623456 | 2011 | 73.456615037348 | 2010 | 74.671892060521 | 2009 | 76.432435305614 | 2008 | 72.480237503387 | 2007 | 71.848972815107 | 2006 | 74.013198718701 | 2005 | 75.314446032225 | 2004 | 74.960398140127 | 2003 | 75.789100051095 | 2002 | 74.973340854912 | 2001 | 75.412972833642 | 2000 | 75.343773855075 | 1999 | 75.443947015752 | 1998 | 74.750697471232 | 1997 | 75.546592560487 | 1996 | 76.023274937805 | 1995 | 75.266413668248 | 1994 | 75.50599874286 | 1993 | 76.011342802803 | 1992 | 75.24141334618 | 1991 | 74.71522260058 | 1990 | 75.442032870053 | 1989 | 76.61434071751 | 1988 | 77.483210772302 | 1987 | 78.221101031626 | 1986 | 77.586261889114 | 1985 | 79.174807218955 | 1984 | 79.870353532584 | 1983 | 80.273883417248 | 1982 | 80.417783324823 | 1981 | 80.820469890192 | 1980 | 79.714725919224 | 1979 | 78.47713420916 | 1978 | 78.261035436778 | 1977 | 78.727214248847 | 1976 | 78.473814555927 | 1975 | 79.100858444289 | 1974 | 75.526037633526 | 1973 | 74.355380801771 | 1972 | 74.144793292217 | 1971 | 73.161849188777 | 1970 | 71.883347580147 |
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