| Year | Value | | 2022 | 47.09999454476 | | 2021 | 46.808363254327 | | 2020 | 46.611750169162 | | 2019 | 46.846446187434 | | 2018 | 46.397279055672 | | 2017 | 45.99669187712 | | 2016 | 45.50429880025 | | 2015 | 45.087632451265 | | 2014 | 44.637634684454 | | 2013 | 44.246680336192 | | 2012 | 43.902667666595 | | 2011 | 43.592555780238 | | 2010 | 43.415881466952 | | 2009 | 43.183096786139 | | 2008 | 43.04862099612 | | 2007 | 42.629311931672 | | 2006 | 42.288986625437 | | 2005 | 42.027859650726 | | 2004 | 41.836161452922 | | 2003 | 41.667831896217 | | 2002 | 41.558287168026 | | 2001 | 41.466049130157 | | 2000 | 41.416970036404 | | 1999 | 41.413555508683 | | 1998 | 41.446622611773 | | 1997 | 41.580725895196 | | 1996 | 41.675574967167 | | 1995 | 41.785732977443 | | 1994 | 41.851437733381 | | 1993 | 42.007947362186 | | 1992 | 42.19009169718 | | 1991 | 42.442107885368 |
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