Year | Value | 2022 | 27.960935814181 | 2021 | 28.607233308359 | 2020 | 27.42451695601 | 2019 | 26.953305672437 | 2018 | 26.947497749071 | 2017 | 27.275767942942 | 2016 | 26.34936909674 | 2015 | 27.093775062415 | 2014 | 25.31045337714 | 2013 | 24.110680786519 | 2012 | 24.023505147592 | 2011 | 22.460637447275 | 2010 | 22.656643286284 | 2009 | 23.283205973418 | 2008 | 27.107446933449 | 2007 | 27.829500627492 | 2006 | 26.366360695178 | 2005 | 26.781761410021 | 2004 | 25.91548467196 | 2003 | 25.362093925068 | 2002 | 26.803843038999 | 2001 | 28.698228001304 | 2000 | 28.740245482723 | 1999 | 28.393887026608 | 1998 | 29.926656677372 | 1997 | 27.922712676553 | 1996 | 30.355200475196 | 1995 | 31.276194550504 | 1994 | 29.948248798945 | 1993 | 29.469112573743 |
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