| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 31.75 | 50.32 | 23.19 |
| 2025 | 25.89 | 38.67 | 15.24 |
| 2024 | 15.6 | 33.52 | 8.69 |
| 2023 | 12.91 | 18.73 | 9.83 |
| 2022 | 13.26 | 27.9 | 2.9 |
| 2021 | 2.87 | 5.12 | 0.91 |
| 2020 | 1.02 | 2.15 | 0.51 |
| 2019 | 0.99 | 1.32 | 0.78 |
| 2018 | 1.31 | 1.91 | 0.87 |
| 2017 | 1.92 | 2.76 | 1.62 |
| 2016 | 2.6 | 4.25 | 1.76 |
| 2015 | 3.29 | 5.53 | 2.28 |
| 2014 | 4.04 | 6.09 | 2.67 |
| 2013 | 3.3 | 4.95 | 1.87 |
| 2012 | 2.11 | 2.81 | 1.48 |