Year | Value | 2023 | 14.041862416944 | 2022 | 14.725847918496 | 2021 | 14.13667513296 | 2020 | 12.719387856195 | 2019 | 13.737694837194 | 2018 | 13.94010799371 | 2017 | 13.605228514999 | 2016 | 13.710430980075 | 2015 | 13.62962936609 | 2014 | 13.49007451882 | 2013 | 14.125305744086 | 2012 | 14.332411091398 | 2011 | 14.85129878353 | 2010 | 14.249575957302 |
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