Year | Value | 2022 | 23.054983008566 | 2021 | 25.968103536189 | 2020 | 25.956866379238 | 2019 | 26.61043355036 | 2018 | 27.004907135588 | 2017 | 27.245636554617 | 2016 | 27.724957996284 | 2015 | 27.794989783109 | 2014 | 27.961004294182 | 2013 | 27.949110369346 | 2012 | 28.182664811357 | 2011 | 28.054642501788 | 2010 | 27.947662613839 | 2009 | 27.862910101116 | 2008 | 27.816594303993 | 2007 | 27.36057868407 | 2006 | 27.083120583232 | 2005 | 26.871216588203 | 2004 | 26.78081058388 | 2003 | 26.97526503996 | 2002 | 27.072176878666 | 2001 | 27.270186191504 | 2000 | 27.335078851558 | 1999 | 27.561247267393 | 1998 | 27.677042963802 | 1997 | 27.997965457625 | 1996 | 27.971229322848 | 1995 | 28.393811458885 | 1994 | 28.958316459309 | 1993 | 29.271399732663 | 1992 | 29.473690098512 | 1991 | 29.667795163099 |
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