| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4 | 5.12 | 3.12 |
| 2024 | 2.62 | 5.17 | 1.89 |
| 2023 | 3.12 | 4.15 | 2.56 |
| 2022 | 2.85 | 4.54 | 2.17 |
| 2021 | 3.64 | 4.85 | 2.91 |
| 2020 | 4.88 | 6.73 | 3.48 |
| 2019 | 5.69 | 7.52 | 3.84 |
| 2018 | 5.07 | 6.32 | 3.54 |
| 2017 | 7.3 | 9.03 | 4.67 |
| 2016 | 8.16 | 10.56 | 4.84 |
| 2015 | 7.83 | 13.77 | 5.6 |
| 2014 | 5.3 | 7.64 | 2.55 |
| 2013 | 2.46 | 3.23 | 2 |
| 2012 | 3.58 | 4.78 | 1.78 |
| 2011 | 8.57 | 12.91 | 4.65 |