| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.27 | 2.52 | 1.9 |
| 2024 | 2.68 | 3.89 | 1.81 |
| 2023 | 3.93 | 5.28 | 3.27 |
| 2022 | 4.46 | 5.99 | 3.4 |
| 2021 | 4.72 | 5.6 | 4.03 |
| 2020 | 4.3 | 6.56 | 3.06 |
| 2019 | 3.74 | 5.23 | 2.97 |
| 2018 | 5.23 | 7.2 | 2.99 |
| 2017 | 8.89 | 12.84 | 5.53 |
| 2016 | 8.9 | 13.4 | 6.43 |
| 2015 | 10.76 | 17.54 | 6.19 |
| 2014 | 7.93 | 10.74 | 6.42 |
| 2013 | 8.56 | 10.88 | 5.8 |
| 2012 | 4.38 | 5.8 | 3.71 |