| Year | Value | | 2021 | 85.24298638 | | 2020 | 82.19830578 | | 2019 | 79.71545398 | | 2018 | 74.82204836 | | 2017 | 67.57124533 | | 2016 | 63.87086474 | | 2015 | 54.21576634 | | 2014 | 49.58 | | 2013 | 45.9 | | 2012 | 42.32 | | 2011 | 38 | | 2010 | 31.4 | | 2009 | 27.72 | | 2008 | 20.82 | | 2007 | 17.66 | | 2006 | 14.84492837 | | 2005 | 11.48319778 | | 2004 | 8.865553461 | | 2003 | 7.898392937 | | 2002 | 6.823725733 | | 2001 | 4.429390697 | | 2000 | 3.704692356 | | 1999 | 1.104743874 | | 1998 | 0.233914189 | | 1997 | 0.142687565 | | 1996 | 0.074987053 | | 1995 | 0.017233601 |
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