Year | Value | 2014 | 27.387258184187 | 2013 | 23.972395012609 | 2012 | 26.144199064878 | 2011 | 28.989955489591 | 2010 | 25.426519588136 | 2009 | 24.202988807377 | 2008 | 24.338861274513 | 2007 | 30.259078608811 | 2006 | 27.597499361719 | 2005 | 28.177561375729 | 2004 | 37.267233488548 | 2003 | 29.438267852091 | 2002 | 29.114841885126 | 2001 | 29.041360401415 | 2000 | 28.964706872497 |
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