Year | Value | 2022 | 35.526404989802 | 2021 | 35.033929398354 | 2020 | 34.626915425574 | 2019 | 34.46002702941 | 2018 | 33.898074052156 | 2017 | 33.292621698633 | 2016 | 32.721085675745 | 2015 | 32.10054447704 | 2014 | 31.619695904837 | 2013 | 30.933802905787 | 2012 | 30.218321077076 | 2011 | 29.452253707948 | 2010 | 28.524448217478 | 2009 | 27.469870834961 | 2008 | 26.385960548468 | 2007 | 25.237305239345 | 2006 | 24.045042292569 | 2005 | 22.906838266308 | 2004 | 21.84389473528 | 2003 | 20.822535521018 | 2002 | 19.899287851278 | 2001 | 19.042732245484 | 2000 | 18.249710101585 | 1999 | 17.653704221714 | 1998 | 17.22059932748 | 1997 | 16.841568454766 | 1996 | 16.497178988429 | 1995 | 16.200236805745 | 1994 | 15.965887672855 | 1993 | 15.803314466199 | 1992 | 15.703155474824 | 1991 | 15.671919237993 |
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