| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.44 | 4.22 | 2.81 |
| 2024 | 3.18 | 4.39 | 2.32 |
| 2023 | 6.15 | 8.8 | 4.16 |
| 2022 | 8.81 | 12.21 | 5.21 |
| 2021 | 7.55 | 14.45 | 3.52 |
| 2020 | 5.42 | 8.07 | 4.2 |
| 2019 | 4.97 | 10.92 | 2.22 |
| 2018 | 2.98 | 4.11 | 1.98 |
| 2017 | 4.21 | 5.94 | 3.13 |
| 2016 | 4.74 | 6.93 | 3.36 |
| 2015 | 7.27 | 15.76 | 3.73 |
| 2014 | 4.07 | 6.16 | 2.82 |
| 2013 | 2.81 | 3.68 | 2.32 |
| 2012 | 3.1 | 3.92 | 2.37 |
| 2011 | 4.5 | 5.41 | 3.05 |
| 2010 | 4.37 | 5.75 | 3.12 |
| 2009 | 3.31 | 4.63 | 2.08 |
| 2008 | 2.59 | 4.19 | 1.4 |