Year | Value | 2022 | 31.558791816472 | 2021 | 30.842383798789 | 2020 | 25.768498415419 | 2019 | 26.537277231081 | 2018 | 28.949268495211 | 2017 | 25.668685135585 | 2016 | 25.013412286572 | 2015 | 26.366709537342 | 2014 | 24.512180821126 | 2013 | 24.282095838188 | 2012 | 27.24417135079 | 2011 | 28.757564309685 | 2010 | 26.283714313898 | 2009 | 20.876204365362 | 2008 | 30.063881910679 | 2007 | 31.266854689758 | 2006 | 30.660876496889 | 2005 | 30.546576821906 | 2004 | 30.260439743494 | 2003 | 28.266238558419 | 2002 | 28.774776224551 | 2001 | 32.512918640969 | 2000 | 36.154207555874 | 1999 | 28.245990545554 | 1998 | 19.323508143563 | 1997 | 21.945356804698 | 1996 | 27.115922604215 | 1995 | 28.022708872617 | 1994 | 29.576019747851 |
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