| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.83 | 6.76 | 1.54 |
| 2024 | 1.64 | 3.2 | 0.86 |
| 2023 | 3.63 | 4.95 | 2.77 |
| 2022 | 6.57 | 8.81 | 4.13 |
| 2021 | 5.89 | 13.26 | 2.03 |
| 2020 | 2.72 | 3.42 | 2.32 |
| 2019 | 3.4 | 4.64 | 2.76 |
| 2018 | 4.4 | 6.92 | 2.44 |
| 2017 | 6.73 | 8.89 | 5.67 |
| 2016 | 17.66 | 36.96 | 6.77 |
| 2015 | 12.93 | 20.82 | 8.09 |
| 2014 | 6.09 | 9.74 | 3.93 |
| 2013 | 3.66 | 4.77 | 2.83 |
| 2012 | 3.31 | 4.19 | 2.51 |
| 2011 | 4.35 | 5.45 | 3.05 |
| 2010 | 5.08 | 5.99 | 3.86 |
| 2009 | 3.19 | 4.51 | 1.98 |
| 2008 | 2.52 | 4.04 | 1.28 |