| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.49 | 3.05 | 2.16 |
| 2024 | 2.69 | 3.41 | 2.17 |
| 2023 | 4.18 | 5.18 | 3.23 |
| 2022 | 4.53 | 5.88 | 2.91 |
| 2021 | 5.51 | 6.55 | 3.93 |
| 2020 | 3.44 | 4.91 | 2.09 |
| 2019 | 2.57 | 3.7 | 2.09 |
| 2018 | 2.81 | 3.7 | 2 |
| 2017 | 3.93 | 6.12 | 2.73 |
| 2016 | 3.12 | 3.95 | 2.44 |
| 2015 | 5.08 | 9.62 | 2.15 |
| 2014 | 5.32 | 6.57 | 4.55 |
| 2013 | 4.03 | 5.26 | 3.11 |
| 2012 | 3.33 | 4.69 | 2.49 |
| 2011 | 7.08 | 10.56 | 3.49 |
| 2010 | 7.64 | 11.82 | 5.3 |
| 2009 | 3.75 | 5.78 | 2.88 |
| 2008 | 3.1 | 4.86 | 1.85 |