Year | Value | 2021 | 25.008992535981 | 2020 | 25.328544337218 | 2019 | 25.848985658859 | 2018 | 25.453878317071 | 2017 | 25.675497204549 | 2016 | 24.396482261514 | 2015 | 23.440284862482 | 2014 | 23.535170998924 | 2013 | 21.44821727888 | 2012 | 21.318435796321 | 2011 | 22.07010104863 | 2010 | 22.139999226995 | 2009 | 21.465339231105 | 2008 | 21.240599112426 | 2007 | 21.61153551837 | 2006 | 22.12074959205 | 2005 | 21.437195590674 |
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