| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.5 | 6.73 | 4.4 |
| 2024 | 4.07 | 5.95 | 2.7 |
| 2023 | 8.8 | 13.27 | 5.87 |
| 2022 | 5.58 | 7.35 | 4.11 |
| 2021 | 5.57 | 8.61 | 4.57 |
| 2020 | 6.14 | 8.66 | 4.35 |
| 2019 | 5.93 | 8.77 | 4.63 |
| 2018 | 5.79 | 9.07 | 3.86 |
| 2017 | 9.15 | 10.63 | 7.26 |
| 2016 | 11.17 | 14.69 | 8.4 |
| 2015 | 18.28 | 24.9 | 6.15 |
| 2014 | 7.15 | 11.16 | 4.53 |
| 2013 | 4.59 | 7.79 | 2.58 |
| 2012 | 3.19 | 4.74 | 2.17 |
| 2011 | 4.44 | 5.9 | 3.87 |