| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.17 | 3.39 | 2.97 |
| 2024 | 3.76 | 4.49 | 3.34 |
| 2023 | 4.59 | 5.44 | 3.94 |
| 2022 | 3.02 | 4.57 | 2.23 |
| 2021 | 3.44 | 4.11 | 2.98 |
| 2020 | 4.03 | 5.22 | 2.98 |
| 2019 | 3.73 | 4.81 | 3 |
| 2018 | 6.02 | 8.28 | 3.21 |
| 2017 | 6.4 | 7.14 | 5.85 |
| 2016 | 6.07 | 7.5 | 4.87 |
| 2015 | 10.63 | 18.46 | 6.47 |
| 2014 | 10.27 | 12.06 | 8.46 |
| 2013 | 10.81 | 12.65 | 9.2 |
| 2012 | 9.03 | 10.91 | 7.46 |
| 2011 | 9.86 | 12.52 | 8.24 |
| 2010 | 11.89 | 14.58 | 9.26 |
| 2009 | 8.15 | 10.57 | 5.87 |