| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.54 | 2.9 | 2.21 |
| 2024 | 3.02 | 4.24 | 2.5 |
| 2023 | 4.11 | 7.04 | 2.71 |
| 2022 | 2.15 | 6.33 | 1.28 |
| 2021 | 1.51 | 1.77 | 1.36 |
| 2020 | 1.8 | 2.24 | 1.54 |
| 2019 | 1.69 | 2.03 | 1.44 |
| 2018 | 1.75 | 2.27 | 1.35 |
| 2017 | 3.92 | 7.37 | 2.21 |
| 2016 | 5.78 | 7.9 | 4.03 |
| 2015 | 4.78 | 8.4 | 3.39 |
| 2014 | 3.52 | 5.08 | 2.75 |
| 2013 | 2.61 | 3.08 | 2.08 |
| 2012 | 3.03 | 4.14 | 2.21 |
| 2011 | 4.61 | 5.74 | 3.01 |
| 2010 | 4.32 | 5.56 | 3.37 |
| 2009 | 3.32 | 4.22 | 2.37 |
| 2008 | 2.7 | 4.25 | 1.56 |