| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.84 | 2.04 | 1.58 |
| 2024 | 1.67 | 3.23 | 1.12 |
| 2023 | 1.91 | 2.21 | 1.63 |
| 2022 | 2.2 | 3.24 | 1.81 |
| 2021 | 3.68 | 5.8 | 2.46 |
| 2020 | 3.42 | 4.68 | 2.16 |
| 2019 | 2.38 | 4.19 | 1.69 |
| 2018 | 2.31 | 3.13 | 1.71 |
| 2017 | 3.43 | 4.33 | 2.9 |
| 2016 | 5.36 | 9.76 | 4.04 |
| 2015 | 7.81 | 15.41 | 4.34 |
| 2014 | 5.96 | 7.32 | 4.8 |
| 2013 | 5.98 | 8.22 | 4.35 |
| 2012 | 4.63 | 5.22 | 3.79 |
| 2011 | 6.1 | 7.52 | 4.92 |
| 2010 | 5.17 | 6.6 | 4.2 |