Year | Value | 2021 | 23.566487697223 | 2020 | 23.745786532275 | 2019 | 23.925085367326 | 2018 | 24.104384202378 | 2017 | 24.28368303743 | 2016 | 24.46297956674 | 2015 | 24.642280707533 | 2014 | 24.821586130417 | 2013 | 25.000891553301 | 2012 | 25.180196976185 | 2011 | 25.359502399069 | 2010 | 25.538807821953 | 2009 | 25.718113244837 | 2008 | 25.897418667721 | 2007 | 26.076724090605 | 2006 | 26.256029513489 | 2005 | 26.435334936372 | 2004 | 26.614640359257 | 2003 | 26.79394578214 | 2002 | 26.973251205024 | 2001 | 27.152556627908 | 2000 | 27.331862050792 | 1999 | 27.511166375704 | 1998 | 27.690470700616 | 1997 | 27.869775025528 | 1996 | 28.04907935044 | 1995 | 28.228383675352 | 1994 | 28.407688000264 | 1993 | 28.586992325175 | 1992 | 28.766296650087 | 1991 | 28.945600974999 | 1990 | 29.124905299911 |
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