| Year | Value | | 2020 | 77.40725017414 | | 2019 | 73.870016589322 | | 2018 | 72.798975138319 | | 2017 | 74.861000157253 | | 2016 | 72.270144412685 | | 2015 | 71.071078632872 | | 2014 | 67.533276659525 | | 2013 | 62.558940177946 | | 2012 | 62.095446643674 | | 2011 | 69.497896504823 | | 2010 | 76.641733550733 | | 2009 | 94.155298785991 | | 2008 | 90.777775771769 | | 2007 | 92.029957865154 | | 2006 | 82.21498128654 | | 2005 | 84.382230530394 | | 2004 | 89.487010674452 | | 2003 | 90.453866032208 | | 2002 | 94.064863501116 | | 2001 | 91.546120760545 |
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