| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.08 | 2.85 | 1.73 |
| 2024 | 2 | 2.45 | 1.63 |
| 2023 | 2.76 | 4.01 | 2.09 |
| 2022 | 5.35 | 10.35 | 3.55 |
| 2021 | 6.4 | 15.86 | 2.14 |
| 2020 | 3 | 4.25 | 2.32 |
| 2019 | 2.19 | 2.88 | 1.77 |
| 2018 | 2.54 | 4.11 | 1.83 |
| 2017 | 6.15 | 7.91 | 3.85 |
| 2016 | 8.3 | 10.2 | 6.21 |
| 2015 | 12.1 | 24.64 | 6.08 |
| 2014 | 4.47 | 6.62 | 3.31 |
| 2013 | 3.29 | 4.12 | 2.47 |
| 2012 | 4.59 | 6.61 | 2.96 |
| 2011 | 11.06 | 15.27 | 5.16 |
| 2010 | 14.29 | 17.81 | 10.73 |