| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.64 | 4.28 | 3.04 |
| 2023 | 3.83 | 4.36 | 3.1 |
| 2022 | 3.86 | 5.38 | 2.78 |
| 2021 | 5.58 | 6.74 | 4.35 |
| 2020 | 4.41 | 5.92 | 3.59 |
| 2019 | 3.72 | 4.89 | 2.65 |
| 2018 | 3.3 | 3.96 | 2.59 |
| 2017 | 5.11 | 6.23 | 3.46 |
| 2016 | 4.82 | 5.84 | 3.14 |
| 2015 | 4.76 | 8.69 | 3.09 |
| 2014 | 4.06 | 5.58 | 3.04 |
| 2013 | 4.25 | 5.51 | 3.11 |
| 2012 | 3.12 | 3.96 | 2.35 |
| 2011 | 4.88 | 9.33 | 2.53 |
| 2010 | 6.29 | 8.74 | 4.42 |
| 2009 | 3.31 | 5.07 | 2.08 |
| 2008 | 3.01 | 6 | 1.33 |