Year | Value | 2017 | 0.655 | 2014 | 1.894 | 2013 | 2.489 | 2012 | 2.184 | 2011 | 1.842 | 2010 | 1.679 | 2009 | 0.1045 | 2008 | 0.1588 | 2007 | 0.185 | 2005 | 0.508 | 2004 | 0.4203 | 2003 | 0.4673 | 2002 | 0.4391 | 2001 | 0.819 | 1997 | 0.473 | 1995 | 0.56 | 1993 | 0.544 | 1991 | 0.393 | 1990 | 0.35 | 1984 | 0.285 | 1970 | 0.187 | 1960 | 0.139 |
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