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| One dataset rule | Two dataset rule | |
| 2014 | 15.9 | 16.1 |
| 2015 | 30.2 | 30.3 |
| 2016 | 21.8 | 23.7 |
| 2017 | 44 | 44.1 |
| 2018 | 42.3 | 42.4 |
| 2019 | 44.9 | 33.8 |