| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 22.58 | 24.48 | 19.79 |
| 2024 | 18.2 | 29.66 | 13.87 |
| 2023 | 16.62 | 20.09 | 12.17 |
| 2022 | 8.99 | 19.49 | 3.51 |
| 2021 | 4.93 | 6.82 | 3.65 |
| 2020 | 3.63 | 5.17 | 1.91 |
| 2019 | 2.52 | 4.21 | 1.64 |
| 2018 | 3.41 | 6.96 | 1.62 |
| 2017 | 5.72 | 7.82 | 3.72 |
| 2016 | 8.36 | 13.11 | 4.24 |
| 2015 | 3.29 | 7.66 | 0.78 |
| 2014 | 0.8 | 1.3 | 0.57 |
| 2013 | 0.7 | 1.14 | 0.43 |
| 2012 | 0.65 | 1 | 0.36 |
| 2011 | 1.37 | 2.03 | 0.82 |
| 2010 | 1.98 | 3.2 | 1.27 |
| 2009 | 2.06 | 2.85 | 1.01 |
| 2008 | 1.78 | 3.64 | 0.67 |
| 2007 | 3 | 4.18 | 1.92 |