| Year | Value | | 2021 | 90.19336882 | | 2020 | 86.37099516 | | 2019 | 85.01758384 | | 2018 | 84.9 | | 2017 | 82.32748693 | | 2016 | 83.55858602 | | 2015 | 76.62959195 | | 2014 | 61.11 | | 2013 | 58 | | 2012 | 55.05 | | 2011 | 52.24960729 | | 2010 | 45 | | 2009 | 41.56 | | 2008 | 37.3 | | 2007 | 35.9 | | 2006 | 34.49775117 | | 2005 | 31.17534703 | | 2004 | 28.17791012 | | 2003 | 25.47377889 | | 2002 | 22.1 | | 2001 | 19.1 | | 2000 | 16.6 | | 1999 | 4.103419297 | | 1998 | 1.662322022 | | 1997 | 1.057092496 | | 1996 | 0.68347561 | | 1995 | 0.346980781 | | 1994 | 0.141084507 | | 1993 | 0.071783144 | | 1992 | 0.036548938 |
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