| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.17 | 7.14 | 5.04 |
| 2024 | 3.54 | 5.42 | 2.61 |
| 2023 | 4.46 | 6.03 | 3.52 |
| 2022 | 3.48 | 4.19 | 2.98 |
| 2021 | 3.61 | 4.17 | 3.21 |
| 2020 | 4.7 | 5.99 | 3.59 |
| 2019 | 3.95 | 5.33 | 3.02 |
| 2018 | 3.71 | 5.36 | 2.8 |
| 2017 | 6.21 | 8.45 | 4.22 |
| 2016 | 8.74 | 12.82 | 7.73 |
| 2015 | 10.61 | 16.08 | 5.77 |
| 2014 | 6.47 | 9.33 | 4.75 |
| 2013 | 3.36 | 5 | 2.3 |
| 2012 | 2.6 | 3.53 | 1.95 |
| 2011 | 3.54 | 5.45 | 2.7 |
| 2010 | 4.67 | 6.16 | 3.23 |
| 2009 | 3.06 | 4.24 | 1.83 |
| 2008 | 2.51 | 4.9 | 1.29 |