| Year | Value | | 2012 | 1.4822743103283 | | 2011 | 14.634325172056 | | 2010 | 1.2431632951048 | | 2009 | 1.091556276349 | | 2008 | 19.560938611144 | | 2007 | 21.581616741618 | | 2006 | 41.675959974049 | | 2005 | 22.786204855154 | | 2004 | 11.878398131032 | | 2003 | 17.144981700211 | | 2002 | 31.878342280731 | | 2001 | 18.26275006332 | | 2000 | 2.4197109537626 | | 1999 | 18.781311393009 |
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