| Year | Value | | 2024 | 88.154659824191 | | 2023 | 88.154659836633 | | 2022 | 94.379679699073 | | 2021 | 93.699784556882 | | 2020 | 91.723891037435 | | 2019 | 85.222041701819 | | 2018 | 84.372026723255 | | 2017 | 84.138435534495 | | 2016 | 83.608008269686 | | 2015 | 81.4667656744 | | 2014 | 79.550695039199 | | 2013 | 77.984257169593 |
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