| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.32 | 4.2 | 1.92 |
| 2024 | 1.84 | 2.57 | 1.24 |
| 2023 | 2 | 2.49 | 1.38 |
| 2022 | 2.18 | 4.98 | 1.32 |
| 2021 | 3.82 | 4.74 | 3.17 |
| 2020 | 3.58 | 4.8 | 2.54 |
| 2019 | 3.41 | 4.17 | 2.68 |
| 2018 | 3.62 | 5.16 | 2.67 |
| 2017 | 5.4 | 6.79 | 4.13 |
| 2016 | 7.22 | 9.53 | 5.99 |
| 2015 | 9.1 | 16.08 | 5.36 |
| 2014 | 8.3 | 15.53 | 3.27 |
| 2013 | 3.52 | 4.37 | 2.54 |
| 2012 | 3.24 | 4.36 | 2.35 |
| 2011 | 8.82 | 14.76 | 3.37 |
| 2010 | 8.6 | 19.65 | 3.42 |
| 2009 | 3.2 | 4.3 | 1.98 |
| 2008 | 2.28 | 3.63 | 1.25 |