| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.78 | 2.08 | 1.47 |
| 2024 | 2.22 | 3.77 | 1.29 |
| 2023 | 3.87 | 5.22 | 2.96 |
| 2022 | 3.25 | 4.66 | 2.23 |
| 2021 | 4.98 | 6.23 | 3.9 |
| 2020 | 7.74 | 10.76 | 4.93 |
| 2019 | 7.36 | 9.11 | 5.91 |
| 2018 | 6.37 | 8.46 | 4.69 |
| 2017 | 7.6 | 9.95 | 5.46 |
| 2016 | 11 | 16.23 | 8.78 |
| 2015 | 15.98 | 31.54 | 8.34 |
| 2014 | 6.54 | 8.8 | 4.59 |
| 2013 | 3.75 | 5.92 | 2.26 |
| 2012 | 3.1 | 4.11 | 2.19 |
| 2011 | 3.87 | 4.52 | 3.12 |