| Year | Value | | 2016 | 0.003 | | 2015 | 0.870362136 | | 2014 | 0.900996 | | 2013 | 0.108996 | | 2012 | 2.252 | | 2011 | 4.871 | | 2010 | 4.148 | | 2009 | 0.576 | | 2008 | 0.974 | | 2007 | 1.04 | | 2006 | 1.083 | | 2005 | 1.302 | | 2004 | 1.335 | | 2003 | 1.455 | | 2002 | 1.247 | | 2001 | 1.454 | | 2000 | 1.434 | | 1999 | 1.3999999762 | | 1998 | 1 | | 1997 | 1 | | 1996 | 0.6999999881 | | 1995 | 0.400000006 | | 1994 | 0.400000006 | | 1993 | 0.3000000119 | | 1992 | 0.200000003 |
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