Year | Value | 2021 | 57.314285714286 | 2020 | 56.885714285714 | 2019 | 56.457142857143 | 2018 | 56.028571428571 | 2017 | 55.6 | 2016 | 55.171428571429 | 2015 | 54.742857142857 | 2014 | 54.325714285714 | 2013 | 53.908571428571 | 2012 | 53.491428571429 | 2011 | 53.074285714286 | 2010 | 52.657142857143 | 2009 | 53.24 | 2008 | 53.822857142857 | 2007 | 54.405714285714 | 2006 | 54.988571428571 | 2005 | 55.571428571429 | 2004 | 56.154285714286 | 2003 | 56.737142857143 | 2002 | 57.32 | 2001 | 57.902857142857 | 2000 | 58.485714285714 | 1999 | 59.648571428571 | 1998 | 60.811428571429 | 1997 | 61.974285714286 | 1996 | 63.137142857143 | 1995 | 64.3 | 1994 | 65.462857142857 | 1993 | 66.625714285714 | 1992 | 67.788571428571 | 1991 | 68.951428571429 | 1990 | 70.114285714286 |
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