| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.64 | 0.71 | 0.58 |
| 2024 | 0.69 | 0.87 | 0.52 |
| 2023 | 0.97 | 1.08 | 0.81 |
| 2022 | 1.25 | 1.99 | 0.93 |
| 2021 | 1.81 | 2.66 | 1.42 |
| 2020 | 2.02 | 2.44 | 1.74 |
| 2019 | 2.14 | 2.63 | 1.58 |
| 2018 | 3.06 | 5.43 | 1.61 |
| 2017 | 6.21 | 9.44 | 4.71 |
| 2016 | 9.62 | 12.57 | 6.74 |
| 2015 | 14.29 | 21.24 | 9.79 |
| 2014 | 13.13 | 18.91 | 9.27 |
| 2013 | 19.82 | 29.95 | 12.11 |
| 2012 | 11.86 | 13.38 | 10.59 |