Year | Value | 2014 | 28.781468065094 | 2013 | 23.679341835139 | 2012 | 25.782565531201 | 2011 | 30.984869902513 | 2010 | 32.399987778136 | 2009 | 32.727092537624 | 2008 | 36.13514159806 | 2007 | 36.545068513078 | 2006 | 38.045550433719 | 2005 | 35.968091137596 | 2004 | 33.226406677989 | 2003 | 28.177705219507 | 2002 | 25.833690820958 | 2001 | 22.869890613119 | 2000 | 13.49923977617 | 1999 | 13.655206007049 | 1998 | 23.988108141232 | 1997 | 26.382134051848 | 1996 | 24.24365850355 | 1995 | 10.078966208861 | 1994 | 9.3329320192168 | 1993 | 9.9633198458999 | 1992 | 20.076200146152 | 1991 | 25.94840243916 | 1990 | 30.163726656455 |
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