| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.66 | 4.6 | 3.08 |
| 2024 | 3.04 | 5.06 | 1.94 |
| 2023 | 4.53 | 5.61 | 3.27 |
| 2022 | 3.65 | 6.07 | 2.18 |
| 2021 | 6.23 | 9.65 | 3.75 |
| 2020 | 16.02 | 27.66 | 7.97 |
| 2019 | 16.3 | 23.42 | 11.83 |
| 2018 | 19.52 | 27.04 | 10.98 |
| 2017 | 33.24 | 36.73 | 26.79 |
| 2016 | 25.52 | 34.85 | 13.62 |
| 2015 | 12.68 | 20.71 | 6.86 |
| 2014 | 7.49 | 9.39 | 5.57 |
| 2013 | 5.23 | 7.41 | 4.14 |
| 2012 | 5.71 | 7.34 | 3.92 |
| 2011 | 10.55 | 17.89 | 5.46 |
| 2010 | 11.21 | 19.36 | 8.58 |
| 2009 | 7.11 | 9.78 | 4.88 |
| 2008 | 6.62 | 13.07 | 3.17 |