| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.72 | 9.01 | 6.81 |
| 2024 | 5.53 | 9.88 | 3.42 |
| 2023 | 6.15 | 7.85 | 5.08 |
| 2022 | 6.6 | 10.18 | 4.26 |
| 2021 | 7.47 | 10.72 | 5.7 |
| 2020 | 5.87 | 9.44 | 3.48 |
| 2019 | 4.48 | 7.73 | 3.28 |
| 2018 | 8.75 | 14.53 | 5.15 |
| 2017 | 12.53 | 16.35 | 10.31 |
| 2016 | 10.17 | 17.1 | 8.11 |
| 2015 | 13.16 | 23.92 | 7.16 |
| 2014 | 9.09 | 13.34 | 6.7 |
| 2013 | 9.47 | 13.54 | 7.83 |
| 2012 | 9.24 | 11.28 | 7.12 |
| 2011 | 12.08 | 16.16 | 8.14 |