| Year | Value | | 2022 | 51.049234168937 | | 2021 | 53.836306415833 | | 2020 | 45.21786940256 | | 2019 | 39.714393242221 | | 2018 | 41.825831271381 | | 2017 | 36.252465319418 | | 2016 | 30.440155084835 | | 2015 | 33.700215069317 | | 2014 | 32.303014952591 | | 2013 | 32.950376602143 | | 2012 | 35.474623414866 | | 2011 | 30.670261535485 | | 2010 | 31.433427558359 |
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