| Year | Value | | 2024 | 70.47699738 | | 2023 | 69.55580139 | | 2022 | 67.88410187 | | 2021 | 67.64354869 | | 2020 | 71.11907507 | | 2019 | 67.970808656515 | | 2018 | 62.67892362306 | | 2017 | 57.148404317079 | | 2016 | 42.978675191011 | | 2015 | 37.305097415537 | | 2014 | 29.070184365652 | | 2013 | 27.93 | | 2012 | 21.20000076 | | 2011 | 16.017290799641 | | 2010 | 15.9 | | 2009 | 14.33 | | 2008 | 12.94 | | 2007 | 11.69 | | 2006 | 11.159601314762 | | 2005 | 9.7380622078135 | | 2004 | 8.407984759007 | | 2003 | 5.2412690536929 | | 2002 | 3.7705850376901 | | 2001 | 1.0797517218891 | | 2000 | 0.54118254881106 | | 1999 | 0.315 | | 1998 | 0.227 | | 1997 | 0.0682 | | 1996 | 0.0319 | | 1995 | 9.17E-5 |
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