| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 18.85 | 27.68 | 10.02 |
| 2024 | 13.48 | 27.94 | 8.26 |
| 2023 | 18.73 | 24.17 | 14.78 |
| 2022 | 9.78 | 19.98 | 4.07 |
| 2021 | 4.94 | 6.82 | 3.75 |
| 2020 | 6.11 | 10.77 | 3.35 |
| 2019 | 4.9 | 8.24 | 2.47 |
| 2018 | 3.56 | 4.96 | 2.09 |
| 2017 | 5.74 | 6.68 | 4.06 |
| 2016 | 6.81 | 9.16 | 5.27 |
| 2015 | 10.22 | 19.44 | 4.61 |
| 2014 | 4.86 | 6.69 | 3.22 |
| 2013 | 3.01 | 4.12 | 2.4 |
| 2012 | 2.81 | 3.42 | 2.06 |
| 2011 | 4.42 | 6.13 | 2.65 |
| 2010 | 6.61 | 9.23 | 5.14 |
| 2009 | 4.91 | 7.88 | 2.69 |
| 2008 | 4.97 | 10.54 | 1.83 |
| 2007 | 11.1 | 15.9 | 7 |