| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.54 | 4.28 | 2.76 |
| 2024 | 2.64 | 3.7 | 1.5 |
| 2023 | 2.07 | 2.42 | 1.65 |
| 2022 | 2.12 | 3.2 | 1.48 |
| 2021 | 2.87 | 3.86 | 2.29 |
| 2020 | 3.75 | 5.87 | 2.42 |
| 2019 | 3.2 | 4.96 | 2.05 |
| 2018 | 3.3 | 5.17 | 1.95 |
| 2017 | 5.15 | 6.58 | 4.15 |
| 2016 | 5.62 | 7.09 | 4.4 |
| 2015 | 6.94 | 13.7 | 3.64 |
| 2014 | 5.98 | 7.26 | 4.63 |
| 2013 | 6.95 | 9.91 | 5.17 |
| 2012 | 5 | 7.21 | 3.51 |
| 2011 | 8.23 | 12.36 | 6.2 |
| 2010 | 9.41 | 13.58 | 7.24 |
| 2009 | 5.6 | 7.27 | 4.1 |