Year | Value | 2021 | 49.784336078872 | 2020 | 49.784336078872 | 2019 | 49.784336078872 | 2018 | 49.784336078872 | 2017 | 49.784336078872 | 2016 | 49.772699545151 | 2015 | 49.76106301143 | 2014 | 49.763568252053 | 2013 | 49.766073492676 | 2012 | 49.768578733299 | 2011 | 49.771083973922 | 2010 | 49.773589214545 | 2009 | 49.737763687445 | 2008 | 49.701938160344 | 2007 | 49.663474325517 | 2006 | 49.627650701501 | 2005 | 49.580777333303 | 2004 | 49.545445610616 | 2003 | 49.510385215048 | 2002 | 49.474689486684 | 2001 | 49.440381943342 | 2000 | 49.401849909714 | 1999 | 49.378292474423 | 1998 | 49.398080738403 | 1997 | 49.404127934842 | 1996 | 49.404264023114 | 1995 | 49.401051874483 | 1994 | 49.390210684969 | 1993 | 49.373647793445 | 1992 | 49.360347041937 |
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