Year | Value | 2022 | 14.969948600283 | 2021 | 14.316848207189 | 2020 | 12.719387857198 | 2019 | 13.737694836264 | 2018 | 13.940107993511 | 2017 | 13.605228515206 | 2016 | 13.710430981606 | 2015 | 13.629629365408 | 2014 | 13.49007451882 | 2013 | 14.125305743026 | 2012 | 14.332411090207 | 2011 | 14.851298783191 | 2010 | 14.249575956569 |
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