Year | Value | 2022 | 51.059062588623 | 2021 | 50.415374561792 | 2020 | 50.117229897575 | 2019 | 50.621380711446 | 2018 | 49.845314587062 | 2017 | 49.117292025018 | 2016 | 48.363697551019 | 2015 | 46.681861745203 | 2014 | 44.788538287398 | 2013 | 44.170832287164 | 2012 | 43.414597939096 | 2011 | 42.791980695579 | 2010 | 43.176893326885 | 2009 | 43.259859889781 | 2008 | 43.762211790747 | 2007 | 44.292242099929 | 2006 | 44.582201846614 | 2005 | 44.952956257303 | 2004 | 44.981752782814 | 2003 | 44.870716524894 | 2002 | 44.915913933233 | 2001 | 44.936522275531 | 2000 | 45.019725263994 | 1999 | 45.315177132798 | 1998 | 45.108162394039 | 1997 | 45.079153805692 | 1996 | 45.07466917998 | 1995 | 45.089183096627 | 1994 | 45.198715593266 | 1993 | 45.204431488973 | 1992 | 45.31695041307 | 1991 | 45.451469406013 |
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