Year | Value | 2022 | 80.140836797116 | 2021 | 80.273642601756 | 2020 | 79.443698760343 | 2019 | 79.991513811978 | 2018 | 79.725701054896 | 2017 | 79.585589825467 | 2016 | 79.2835271045 | 2015 | 78.76756539292 | 2014 | 78.647037378972 | 2013 | 78.170166586923 | 2012 | 77.605611038638 | 2011 | 77.134982170187 | 2010 | 77.02358677593 | 2009 | 77.262598810156 | 2008 | 77.079403476264 | 2007 | 76.543229574451 | 2006 | 75.570460313356 | 2005 | 74.247367255246 | 2004 | 73.50518625491 | 2003 | 73.031357085657 | 2002 | 71.779157187633 | 2001 | 72.046581633717 | 2000 | 72.619347326522 | 1999 | 73.184873378059 | 1998 | 72.544569204587 | 1997 | 71.271556621869 | 1996 | 71.17196062424 | 1995 | 70.918249167568 | 1994 | 70.61392109164 | 1993 | 70.600711491731 | 1992 | 70.640057783835 | 1991 | 70.666065995643 |
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