Year | Value | 2021 | 73.726499657671 | 2020 | 73.728367440942 | 2019 | 73.730793274767 | 2018 | 73.733219268228 | 2017 | 73.733219268228 | 2016 | 73.735645421342 | 2015 | 73.735645421342 | 2014 | 73.630590016124 | 2013 | 73.520681825661 | 2012 | 73.410773635197 | 2011 | 73.300865444733 | 2010 | 73.188548864758 | 2009 | 73.25555774926 | 2008 | 73.322566633761 | 2007 | 73.34372060903 | 2006 | 73.405859721811 | 2005 | 73.357037328868 | 2004 | 73.423894415444 | 2003 | 73.490751502019 | 2002 | 73.557608588595 | 2001 | 73.62446567517 | 2000 | 73.691322761745 | 1999 | 73.504084178732 | 1998 | 73.316845595719 | 1997 | 73.129607012706 | 1996 | 72.942368429692 | 1995 | 72.755129846679 | 1994 | 72.567891263666 | 1993 | 72.380652680653 | 1992 | 72.193414097639 | 1991 | 72.006175514626 | 1990 | 71.818936931613 |
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