Year | Value | 2022 | 57.531175045169 | 2021 | 57.228373407557 | 2020 | 56.270227811656 | 2019 | 55.038312641899 | 2018 | 54.475696249491 | 2017 | 55.157654225047 | 2016 | 55.774170019561 | 2015 | 56.527834464339 | 2014 | 56.611766104839 | 2013 | 55.823866880707 | 2012 | 56.796816735769 | 2011 | 57.101599519652 | 2010 | 56.171446922457 | 2009 | 54.673140164479 | 2008 | 54.030039603729 | 2007 | 52.840332430995 | 2006 | 52.61071322076 | 2005 | 52.288855828014 | 2004 | 52.562892042154 | 2003 | 52.440839244001 | 2002 | 52.455850700739 | 2001 | 52.423830093653 | 2000 | 52.809251093103 | 1999 | 52.813431059631 | 1998 | 52.843117414241 | 1997 | 53.339389156993 | 1996 | 53.761680898766 | 1995 | 53.356590839912 | 1994 | 53.296616855372 | 1993 | 53.213605855103 | 1992 | 53.064318123855 | 1991 | 52.841331331297 |
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