| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.31 | 6.2 | 1.34 |
| 2023 | 2.05 | 2.45 | 1.74 |
| 2022 | 2.11 | 2.85 | 1.64 |
| 2021 | 2.61 | 3.49 | 2.08 |
| 2020 | 2.25 | 2.75 | 1.91 |
| 2019 | 2.17 | 2.93 | 1.43 |
| 2018 | 2.1 | 2.76 | 1.38 |
| 2017 | 3.59 | 5.36 | 2.58 |
| 2016 | 5.36 | 6.88 | 4.6 |
| 2015 | 7.72 | 12.16 | 4.57 |
| 2014 | 5.38 | 7.06 | 3.52 |
| 2013 | 3.8 | 4.54 | 3.13 |
| 2012 | 4.77 | 5.86 | 3.19 |
| 2011 | 8.45 | 13.81 | 4.07 |
| 2010 | 9.53 | 15.66 | 6.21 |
| 2009 | 5.7 | 8.16 | 3.26 |
| 2008 | 3.57 | 6.43 | 1.66 |