Year | Value | 2021 | 26.084410406106 | 2020 | 26.252612454069 | 2019 | 26.419656921654 | 2018 | 26.588425465894 | 2017 | 26.752923085137 | 2016 | 26.91752300108 | 2015 | 27.085585965001 | 2014 | 27.24950019633 | 2013 | 27.413299823052 | 2012 | 27.577109245495 | 2011 | 27.885613965528 | 2010 | 28.050616222884 | 2009 | 28.19686266708 | 2008 | 28.342335979885 | 2007 | 28.487725579335 | 2006 | 28.6332161457 | 2005 | 28.778641584368 | 2004 | 28.924131442224 | 2003 | 29.252446834623 | 2002 | 29.398796945861 | 2001 | 29.545147057099 | 2000 | 29.691497168337 | 1999 | 29.83007620105 | 1998 | 29.968655233764 | 1997 | 30.107234266478 | 1996 | 30.245813299191 | 1995 | 30.384392331905 | 1994 | 30.522971364619 | 1993 | 30.661550397332 | 1992 | 30.800129430046 | 1991 | 30.93870846276 | 1990 | 31.077287495473 |
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