| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.4 | 4.95 | 3.65 |
| 2024 | 5.06 | 8.39 | 3.49 |
| 2023 | 9.39 | 10.99 | 7.75 |
| 2022 | 10.58 | 15.58 | 6.88 |
| 2021 | 7.42 | 9.59 | 5.65 |
| 2020 | 6.03 | 9.46 | 4.13 |
| 2019 | 5.53 | 7.57 | 4.38 |
| 2018 | 6.87 | 11.09 | 4.17 |
| 2017 | 12.43 | 20.53 | 8.59 |
| 2016 | 18.75 | 28.24 | 15.12 |
| 2015 | 11.29 | 20.3 | 7.6 |
| 2014 | 8.08 | 11.66 | 4.12 |
| 2013 | 3.6 | 5.16 | 2.8 |
| 2012 | 3.36 | 4.33 | 2.21 |
| 2011 | 4.69 | 6.57 | 3.25 |
| 2010 | 7.74 | 10.17 | 6.27 |
| 2009 | 7.52 | 9.7 | 4.39 |