| Year | Value | | 2021 | 52.95652173913 | | 2020 | 52.95652173913 | | 2019 | 52.95652173913 | | 2018 | 52.95652173913 | | 2017 | 52.95652173913 | | 2016 | 52.95652173913 | | 2015 | 64.108695652174 | | 2014 | 64.469565217391 | | 2013 | 64.830434782609 | | 2012 | 65.191304347826 | | 2011 | 65.552173913044 | | 2010 | 65.913043478261 | | 2009 | 66.269565217391 | | 2008 | 66.626086956522 | | 2007 | 66.982608695652 | | 2006 | 67.339130434783 | | 2005 | 67.695652173913 | | 2004 | 68.052173913044 | | 2003 | 68.408695652174 | | 2002 | 68.765217391304 | | 2001 | 69.121739130435 | | 2000 | 69.478260869565 | | 1999 | 69.836956521739 | | 1998 | 70.195652173913 | | 1997 | 70.554347826087 | | 1996 | 70.913043478261 | | 1995 | 71.271739130435 | | 1994 | 71.630434782609 | | 1993 | 71.989130434783 | | 1992 | 72.347826086957 | | 1991 | 72.70652173913 |
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