| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.27 | 6.79 | 4.42 |
| 2024 | 4.38 | 6.15 | 3.2 |
| 2023 | 5.09 | 7.63 | 4.12 |
| 2022 | 4.27 | 5.76 | 3.22 |
| 2021 | 4.19 | 5.71 | 3.45 |
| 2020 | 3.47 | 5.08 | 2.31 |
| 2019 | 3.05 | 4 | 2.4 |
| 2018 | 5.56 | 7.77 | 3 |
| 2017 | 10.7 | 16.15 | 7.41 |
| 2016 | 32.16 | 69.56 | 14.72 |
| 2015 | 20.26 | 41.85 | 13.06 |
| 2014 | 8.63 | 13.99 | 4.9 |
| 2013 | 4.59 | 5.72 | 3.58 |
| 2012 | 5.14 | 6.29 | 3.83 |
| 2011 | 7.45 | 11.11 | 4.86 |
| 2010 | 6.08 | 8.26 | 4.54 |
| 2009 | 4.44 | 6.22 | 2.75 |
| 2008 | 3.23 | 5.2 | 1.63 |