| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 0 | ||
| 2025 | 0 | ||
| 2024 | 9.39 | 13.55 | 2.61 |
| 2023 | 10.05 | 16.54 | 4.92 |
| 2022 | 14.24 | 19.27 | 11.94 |
| 2021 | 19.2 | 27.9 | 13.24 |
| 2020 | 24.4 | 68.44 | 2.45 |
| 2019 | 6.37 | 13.96 | 2.2 |
| 2018 | 5.82 | 10.59 | 3.1 |
| 2017 | 5.47 | 8.5 | 4.05 |
| 2016 | 6.04 | 8.38 | 4.41 |
| 2015 | 9.65 | 17.71 | 4.55 |
| 2014 | 6.52 | 9.86 | 4.24 |
| 2013 | 3.97 | 5.56 | 3.05 |
| 2012 | 4.12 | 6.08 | 2.47 |
| 2011 | 8.09 | 12.11 | 4.35 |
| 2010 | 9.48 | 12.67 | 7.44 |
| 2009 | 6.58 | 8.37 | 3.49 |
| 2008 | 5.18 | 9.17 | 1.86 |
| 2007 | 8.72 | 10.76 | 6.84 |