Year | Value | 2022 | 28.083857939172 | 2021 | 24.495739421894 | 2020 | 26.23044454895 | 2019 | 26.682685319502 | 2018 | 27.791330152525 | 2017 | 25.934092266347 | 2016 | 23.901196022243 | 2015 | 27.643392058977 | 2014 | 30.141277888509 | 2013 | 28.987825185733 | 2012 | 29.754825739094 | 2011 | 32.79171291158 | 2010 | 30.389274086211 | 2009 | 29.41296528468 | 2008 | 30.085613094993 | 2007 | 29.390377691789 | 2006 | 31.064075303853 | 2005 | 28.454821003827 | 2004 | 27.416250266981 | 2003 | 28.520741268909 | 2002 | 30.255850999197 | 2001 | 24.809925484289 | 2000 | 21.171172327483 | 1999 | 13.707790329059 | 1998 | 15.153650686073 | 1997 | 16.060322687809 | 1996 | 19.05267509131 | 1995 | 14.910917520386 |
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