| Year | Value | | 2021 | 0.002113 | | 2020 | 0.004077 | | 2016 | 0.017582064 | | 2015 | 0.015066036 | | 2014 | 0.011652 | | 2009 | 1.643 | | 2008 | 1.886 | | 2007 | 1.99 | | 2006 | 1.88 | | 2005 | 1.809 | | 2004 | 1.75 | | 2003 | 1.495 | | 2002 | 2.313 | | 2001 | 2.083 | | 2000 | 2.227 | | 1999 | 2.0999999046 | | 1998 | 0.8000000119 | | 1997 | 7.8000001907 | | 1996 | 1.5 |
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