Year | Value | 2021 | 12.825004964795 | 2020 | 12.022907199057 | 2019 | 13.301516011913 | 2018 | 14.67253298414 | 2017 | 13.019030233196 | 2016 | 13.788235612381 | 2015 | 14.173064514492 | 2014 | 12.697767073307 | 2013 | 13.35496284788 | 2012 | 14.66297503345 | 2011 | 14.50907256424 | 2010 | 16.321438373621 | 2009 | 18.629470629096 | 2008 | 25.353389205552 | 2007 | 23.726698728867 | 2006 | 22.223096622807 | 2005 | 20.149656277904 | 2004 | 18.371346900892 | 2003 | 17.688121909596 | 2002 | 14.201038323074 | 2001 | 15.754664244288 | 2000 | 16.624734502617 | 1999 | 16.672476193498 | 1998 | 17.112328938805 | 1997 | 20.734590954938 | 1996 | 18.79977481117 | 1995 | 19.887646928 | 1994 | 24.750182656101 | 1993 | 26.639593908629 | 1992 | 20.54347826087 |
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