| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 2.75 | 3.08 | 2.42 |
| 2025 | 2.62 | 3.25 | 2.01 |
| 2024 | 1.31 | 3.17 | 0.69 |
| 2023 | 1.58 | 2.38 | 1.15 |
| 2022 | 2.37 | 3.12 | 1.92 |
| 2021 | 2.47 | 3.02 | 1.85 |
| 2020 | 2.06 | 3.48 | 1.05 |
| 2019 | 0.89 | 1.19 | 0.62 |
| 2018 | 1.72 | 3.21 | 0.64 |
| 2017 | 3.59 | 4.06 | 3.21 |
| 2016 | 4.28 | 6.48 | 3.55 |
| 2015 | 11.79 | 22.5 | 5.61 |
| 2014 | 10.56 | 14.36 | 8.07 |
| 2013 | 13.48 | 17.63 | 8.64 |
| 2012 | 8.88 | 11.23 | 6.86 |
| 2011 | 13.03 | 17.05 | 7.67 |
| 2010 | 11.89 | 19.69 | 7.81 |
| 2009 | 17.95 | 20.5 | 9.4 |