Year | Value | 2022 | 64.937831180241 | 2021 | 64.683514261734 | 2020 | 64.253936121895 | 2019 | 63.631795673238 | 2018 | 62.833798973487 | 2017 | 63.104220987755 | 2016 | 63.390701811154 | 2015 | 61.495001936561 | 2014 | 60.857115804176 | 2013 | 60.731425291646 | 2012 | 61.185676711587 | 2011 | 60.629201631133 | 2010 | 60.668338013607 | 2009 | 59.513800769992 | 2008 | 59.197148910711 | 2007 | 57.948065361273 | 2006 | 58.627709632638 | 2005 | 57.275795995962 | 2004 | 56.207239117572 | 2003 | 56.549845392481 | 2002 | 56.899574009964 | 2001 | 57.004223103785 | 2000 | 56.578649708909 | 1999 | 56.778307105856 | 1998 | 56.457416368458 | 1997 | 56.495427381719 | 1996 | 56.105171772788 | 1995 | 55.506645740266 | 1994 | 55.291682229471 | 1993 | 54.962105316196 | 1992 | 54.839136270397 | 1991 | 54.712316635578 |
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