Year | Value | 2021 | 73.39756097561 | 2020 | 77.236585365854 | 2019 | 74.046341463415 | 2018 | 72.841463414634 | 2017 | 74.3 | 2016 | 74.309756097561 | 2015 | 74.295121951219 | 2014 | 73.229268292683 | 2013 | 73.119512195122 | 2012 | 74.275609756098 | 2011 | 72.724390243902 | 2010 | 73.19756097561 | 2009 | 73.082926829268 | 2008 | 73.163414634146 | 2007 | 73.143902439024 | 2006 | 72.217073170732 | 2005 | 72.131707317073 | 2004 | 72.660975609756 | 2003 | 71.029268292683 | 2002 | 71.087804878049 | 2001 | 73.253658536585 | 2000 | 72.778048780488 | 1999 | 72.668292682927 | 1998 | 71.746341463415 | 1997 | 71.212195121951 | 1996 | 71.560975609756 | 1995 | 72.482926829268 | 1994 | 70.729268292683 | 1993 | 69.468292682927 | 1992 | 71.214634146341 | 1991 | 70.712195121951 | 1990 | 68.107317073171 | 1989 | 67.970731707317 | 1988 | 68.70243902439 | 1987 | 68.236585365854 | 1986 | 68.656097560976 | 1985 | 69.69756097561 | 1984 | 69.553658536585 | 1983 | 70.382926829268 | 1982 | 69.324390243902 | 1981 | 70.187804878049 | 1980 | 69.59756097561 |
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