| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 2.49 | 2.66 | 2.26 |
| 2025 | 2.22 | 2.48 | 2.02 |
| 2024 | 2.62 | 3.57 | 1.92 |
| 2023 | 4.21 | 5.88 | 2.95 |
| 2022 | 3.54 | 6.22 | 2.51 |
| 2021 | 3.14 | 3.56 | 2.77 |
| 2020 | 4.5 | 6.48 | 3.18 |
| 2019 | 6.56 | 10.53 | 3.57 |
| 2018 | 4.48 | 6.59 | 2.76 |
| 2017 | 6.04 | 8.17 | 4.12 |
| 2016 | 17.92 | 36.71 | 8.09 |
| 2015 | 10.66 | 26.73 | 4.59 |
| 2014 | 4.53 | 6.78 | 2.46 |
| 2013 | 2.93 | 3.45 | 2.13 |
| 2012 | 3.57 | 4.84 | 2.03 |
| 2011 | 4.12 | 5.16 | 3.11 |