Year | Value | 2022 | 67.974928772551 | 2021 | 67.21315618083 | 2020 | 68.174331161413 | 2019 | 68.098837102041 | 2018 | 68.498695714527 | 2017 | 68.652001094634 | 2016 | 69.300770678364 | 2015 | 70.023825810715 | 2014 | 70.985317767586 | 2013 | 71.27833050451 | 2012 | 71.536955982394 | 2011 | 71.425935521766 | 2010 | 71.693103896043 | 2009 | 71.694284315075 | 2008 | 69.141746420724 | 2007 | 69.557472099746 | 2006 | 70.386248473174 | 2005 | 71.088416233574 | 2004 | 71.938800572847 | 2003 | 72.863633704491 | 2002 | 72.151926519096 | 2001 | 70.723684893158 | 2000 | 70.885185406421 | 1999 | 71.375033078322 | 1998 | 70.927604965825 | 1997 | 70.77789760626 | 1996 | 71.394704388828 | 1995 | 71.6483536491 | 1994 | 71.898949182643 | 1993 | 72.329643713636 | 1992 | 71.990750436539 | 1991 | 71.652783616133 | 1990 | 71.100769884782 | 1989 | 71.426126913984 | 1988 | 72.62957018386 | 1987 | 74.142887388442 | 1986 | 72.830456958425 | 1985 | 73.30146454945 | 1984 | 72.620636889535 | 1983 | 75.049932640582 | 1982 | 74.901111101367 | 1981 | 74.343351668596 | 1980 | 75.528872324616 | 1979 | 76.123711778917 | 1978 | 75.720892870198 | 1977 | 74.985173423825 | 1976 | 73.335507904218 | 1975 | 72.83585686545 | 1974 | 68.752885512342 | 1973 | 70.18306363828 | 1972 | 70.228676305118 | 1971 | 70.451509158057 | 1970 | 70.804443162717 | 1969 | 70.659039105958 |
|