Year | Value | 2021 | 57.813693966269 | 2020 | 53.848692358742 | 2019 | 47.067973812149 | 2018 | 41.7445987709 | 2017 | 37.72699816242 | 2016 | 35.190708839171 | 2015 | 32.409817787727 | 2014 | 29.777873314085 | 2013 | 27.382983301276 | 2012 | 25.279158034673 | 2011 | 22.799149844062 | 2010 | 19.918044969912 | 2009 | 16.410465705229 | 2008 | 13.567056024711 | 2007 | 10.865010178946 | 2006 | 8.3293488038378 | 2005 | 6.7844317274437 | 2004 | 5.7490651665987 | 2003 | 4.4789996832417 | 2002 | 3.4155904550697 | 2001 | 2.0192807358991 | 2000 | 1.4194471516694 | 1999 | 0.6973388595318 | 1998 | 0.34395255742989 | 1997 | 0.15422211334463 | 1996 | 0.077412050292275 | 1995 | 0.032393810179978 | 1994 | 0.010361932661432 | 1993 | 0.003804727744803 | 1992 | 0.0012495335078169 | 1991 | 0.00035548678357196 |
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