| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 7.2 | 7.83 | 6.27 |
| 2025 | 5.42 | 9.09 | 2.41 |
| 2024 | 2.35 | 3.55 | 1.77 |
| 2023 | 2.77 | 3.13 | 2.28 |
| 2022 | 2.46 | 4.19 | 1.64 |
| 2021 | 1.6 | 2 | 1.4 |
| 2020 | 1.94 | 3.02 | 1.38 |
| 2019 | 2.3 | 3.07 | 1.49 |
| 2018 | 1.76 | 2.41 | 1.31 |
| 2017 | 3.38 | 4.51 | 2.14 |
| 2016 | 3.27 | 4.36 | 2.25 |
| 2015 | 2.98 | 4.88 | 1.96 |
| 2014 | 1.96 | 2.64 | 1.59 |
| 2013 | 1.69 | 1.98 | 1.31 |
| 2012 | 1.99 | 2.9 | 1.42 |
| 2011 | 4.67 | 9.94 | 1.85 |
| 2010 | 6.15 | 9.22 | 4.79 |
| 2009 | 4.75 | 6.18 | 4.02 |