Year | Value | 2020 | 0.082 | 2019 | 0.071 | 2018 | 0.081 | 2017 | 0.066 | 2016 | 0.067 | 2015 | 0.064 | 2014 | 0.061 | 2013 | 0.052 | 2012 | 0.047 | 2011 | 0.042 | 2010 | 0.041 | 2009 | 0.042 | 2008 | 0.042 | 2007 | 0.042 | 2006 | 0.047 | 2005 | 0.043 | 2004 | 0.051 | 2003 | 0.039 | 2002 | 0.052 | 2001 | 0.039 | 2000 | 0.042 | 1996 | 0.03 | 1993 | 0.019 |
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