Year | Value | 2019 | 0.88 | 2018 | 0.88 | 2017 | 0.85 | 2016 | 0.8 | 2015 | 0.77 | 2014 | 0.6 | 2013 | 0.59 | 2012 | 0.63 | 2011 | 0.55 | 2010 | 0.55 | 2009 | 0.5 | 2008 | 0.38 | 2007 | 0.36 | 2005 | 0.3 | 2002 | 0.34 | 2001 | 0.3 | 1999 | 0.3000000119 | 1994 | 0.3048999906 | 1991 | 0.3080999851 | 1990 | 0.3041999936 | 1985 | 0.28780001401901 | 1981 | 0.22519999742508 | 1980 | 0.21580000221729 |
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