Year | Value | 2022 | 68.867844965974 | 2021 | 68.56820141369 | 2020 | 68.105617623788 | 2019 | 68.687135040803 | 2018 | 69.35890136995 | 2017 | 69.503007590224 | 2016 | 69.530133002203 | 2015 | 69.532200646203 | 2014 | 69.936132696992 | 2013 | 70.118840946091 | 2012 | 70.140184045506 | 2011 | 69.062707182091 | 2010 | 67.868141976023 | 2009 | 66.769703764628 | 2008 | 66.125275266429 | 2007 | 65.20318624943 | 2006 | 65.116987661751 | 2005 | 65.17737492127 | 2004 | 65.173544973892 | 2003 | 65.778246990108 | 2002 | 65.925172781248 | 2001 | 65.620409977523 | 2000 | 64.814500229936 | 1999 | 63.755423612916 | 1998 | 62.735449067135 | 1997 | 62.002278242169 | 1996 | 61.689498892997 | 1995 | 61.628004775143 | 1994 | 61.679918090521 | 1993 | 61.752682824599 | 1992 | 61.811081262965 | 1991 | 61.799455499476 |
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