| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.45 | 4.11 | 3.07 |
| 2024 | 3.88 | 5.61 | 2.85 |
| 2023 | 5.53 | 8.66 | 3.5 |
| 2022 | 14.84 | 22.74 | 7.68 |
| 2021 | 13.74 | 29.81 | 4.24 |
| 2020 | 1.95 | 4.15 | 0.81 |
| 2019 | 2.17 | 2.95 | 1.51 |
| 2018 | 3.25 | 4.8 | 1.95 |
| 2017 | 4.32 | 7.02 | 3.2 |
| 2016 | 5.33 | 10.03 | 3.73 |
| 2015 | 6.62 | 12.52 | 3.78 |
| 2014 | 5.98 | 9.37 | 3.64 |
| 2013 | 5.06 | 6.23 | 3.92 |
| 2012 | 4.95 | 6.84 | 3.22 |
| 2011 | 10.36 | 15.3 | 4.46 |
| 2010 | 6.52 | 11.55 | 3.78 |
| 2009 | 3.64 | 4.83 | 2.68 |
| 2008 | 3.03 | 5.12 | 1.51 |