Year | Value | 2021 | 23.100858859181 | 2020 | 22.011938420962 | 2019 | 22.634110490557 | 2018 | 24.008566010536 | 2017 | 23.448258971293 | 2016 | 22.842329184466 | 2015 | 24.354537805729 | 2014 | 26.134525449295 | 2013 | 26.190847077988 | 2012 | 25.824141250061 | 2011 | 24.93665680944 | 2010 | 24.46824242214 | 2009 | 23.781462787266 | 2008 | 25.254169875685 | 2007 | 24.788537533878 | 2006 | 25.287750479392 | 2005 | 25.471329929015 | 2004 | 25.537961260658 | 2003 | 25.07661801094 | 2002 | 25.712345094836 | 2001 | 26.786512110206 | 2000 | 27.274741356849 | 1999 | 27.009511876639 | 1998 | 27.163041786782 | 1997 | 26.567024317106 | 1996 | 26.029891673367 | 1995 | 25.62241940319 |
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