| Year | Value | | 2022 | 57.519976226798 | | 2021 | 51.44515886811 | | 2020 | 41.781697548645 | | 2019 | 46.150702938713 | | 2018 | 49.742036962955 | | 2017 | 46.599930425846 | | 2016 | 43.361607468069 | | 2015 | 45.568986513603 | | 2014 | 55.749333893188 | | 2013 | 58.251950681382 | | 2012 | 60.329167062583 | | 2011 | 60.09937758821 |
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