Year | Value | 2022 | 24.710943344341 | 2021 | 27.22044823697 | 2020 | 26.583247587757 | 2019 | 28.879977174616 | 2018 | 28.635595654226 | 2017 | 29.281612838812 | 2016 | 25.541837654534 | 2015 | 21.667050578898 | 2014 | 20.607512360312 | 2013 | 26.481517331533 | 2012 | 25.784391305555 | 2011 | 22.637109740073 | 2010 | 20.32242897862 | 2009 | 22.643651065178 | 2008 | 22.118173245369 |
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