Year | Value | 2022 | 78.744975983974 | 2021 | 79.151754949276 | 2020 | 79.183137914224 | 2019 | 78.961132418015 | 2018 | 78.921961215151 | 2017 | 78.719022494734 | 2016 | 78.545302255334 | 2015 | 78.563266125939 | 2014 | 78.467934671205 | 2013 | 77.684968270231 | 2012 | 77.857861656741 | 2011 | 77.460172637191 | 2010 | 77.6260918866 | 2009 | 77.829105862326 | 2008 | 78.414193711788 | 2007 | 78.276725877246 | 2006 | 77.85014882955 | 2005 | 77.715246977546 | 2004 | 77.607465809592 | 2003 | 77.351464933074 | 2002 | 77.420043568885 | 2001 | 77.088277000025 | 2000 | 77.529899066547 | 1999 | 77.44762426135 | 1998 | 77.035005609083 | 1997 | 77.166585456573 | 1996 | 78.04763988719 | 1995 | 78.529156637177 | 1994 | 79.114826952964 | 1993 | 80.124980143066 | 1992 | 80.610090351821 | 1991 | 80.772798034333 |
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