| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.91 | 2.12 | 1.69 |
| 2024 | 1.84 | 2.54 | 1.39 |
| 2023 | 2.62 | 4.45 | 1.67 |
| 2022 | 1.72 | 2.65 | 1.3 |
| 2021 | 2.31 | 3.39 | 1.59 |
| 2020 | 3.57 | 5.23 | 1.9 |
| 2019 | 3.54 | 5.4 | 2.3 |
| 2018 | 4.49 | 6.93 | 2.97 |
| 2017 | 8.2 | 10.6 | 5.64 |
| 2016 | 12.4 | 23.32 | 8.67 |
| 2015 | 22.32 | 41.69 | 15.05 |
| 2014 | 37.09 | 86.09 | 17.59 |
| 2013 | 8.3 | 19.73 | 5.16 |
| 2012 | 5.16 | 6.25 | 3.9 |
| 2011 | 5.28 | 6.22 | 3.74 |
| 2010 | 5.74 | 6.94 | 4.52 |
| 2009 | 4.26 | 6.53 | 2.55 |
| 2008 | 3.26 | 6.47 | 1.54 |