| Year | Value | | 2021 | 72.006469048582 | | 2020 | 72.006469048582 | | 2019 | 72.006469048582 | | 2018 | 72.006469048582 | | 2017 | 72.006469048582 | | 2016 | 72.006469048582 | | 2015 | 72.006469048582 | | 2014 | 72.006469048582 | | 2013 | 72.006469048582 | | 2012 | 72.006469048582 | | 2011 | 72.006469048582 | | 2010 | 72.351201242738 | | 2009 | 72.787436426702 | | 2008 | 73.095993020237 | | 2007 | 73.521588321665 | | 2006 | 73.840784797736 | | 2005 | 74.223820569021 | | 2004 | 74.585576575235 | | 2003 | 74.883493286234 | | 2002 | 75.223969527376 | | 2001 | 75.543166003447 | | 2000 | 75.543166003447 | | 1999 | 75.628285063733 | | 1998 | 75.543166003447 | | 1997 | 75.543166003447 | | 1996 | 75.543166003447 | | 1995 | 75.543166003447 | | 1994 | 75.43676717809 | | 1993 | 75.43676717809 | | 1992 | 75.223969527376 |
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