| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.67 | 2.04 | 1.2 |
| 2023 | 2.19 | 2.67 | 1.6 |
| 2022 | 2.2 | 3.43 | 1.3 |
| 2021 | 1.63 | 2.8 | 1.02 |
| 2020 | 1.78 | 2.32 | 1.4 |
| 2019 | 2.82 | 4.34 | 1.58 |
| 2018 | 3.89 | 6.14 | 2.26 |
| 2017 | 6.29 | 7 | 5.7 |
| 2016 | 7.89 | 13.94 | 5.91 |
| 2015 | 14.2 | 32.38 | 6.91 |
| 2014 | 4.64 | 10.38 | 3.28 |
| 2013 | 2.76 | 3.48 | 2.22 |
| 2012 | 2.96 | 3.79 | 1.97 |
| 2011 | 4.41 | 5.99 | 3.45 |