| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.53 | 5.64 | 3.71 |
| 2024 | 3.39 | 5.61 | 2.12 |
| 2023 | 3.73 | 5.11 | 3 |
| 2022 | 3.92 | 5.01 | 2.97 |
| 2021 | 5.17 | 7.76 | 3.62 |
| 2020 | 4.33 | 5.47 | 3.15 |
| 2019 | 4.12 | 5.35 | 3.1 |
| 2018 | 4.28 | 6.06 | 2.88 |
| 2017 | 6.65 | 8.28 | 5.33 |
| 2016 | 5.91 | 8.16 | 3.49 |
| 2015 | 5.24 | 9.19 | 3.33 |
| 2014 | 3.97 | 5.25 | 3.16 |
| 2013 | 3.39 | 4.28 | 2.74 |
| 2012 | 4.73 | 5.73 | 3.12 |
| 2011 | 8.69 | 14.67 | 3.82 |
| 2010 | 8.04 | 14.56 | 5.27 |
| 2009 | 5.76 | 10.41 | 3.37 |
| 2008 | 4.21 | 9.06 | 1.93 |