Year | Value | 2021 | 56.824301001036 | 2020 | 56.824301001036 | 2019 | 56.824301001036 | 2018 | 56.763893683121 | 2017 | 56.573450716382 | 2016 | 56.579606069499 | 2015 | 56.577879818398 | 2014 | 56.569248562896 | 2013 | 56.578402264724 | 2012 | 56.131326382656 | 2011 | 56.098529310226 | 2010 | 56.060553752676 | 2009 | 56.062279914382 | 2008 | 56.055375267555 | 2007 | 55.985362401395 | 2006 | 56.003175918255 | 2005 | 56.011598605406 | 2004 | 56.067248938447 | 2003 | 56.063796734215 | 2002 | 56.174267269652 | 2001 | 56.161215154915 | 2000 | 56.207819107621 | 1999 | 56.390782773798 | 1998 | 56.715284370415 | 1997 | 57.100198498317 | 1996 | 57.28661430914 | 1995 | 57.454043324415 | 1994 | 57.462673686027 | 1993 | 57.536894795892 | 1992 | 57.58522482092 |
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