| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.76 | 3.15 | 2.17 |
| 2023 | 4.19 | 5.55 | 2.96 |
| 2022 | 4.75 | 6.65 | 3.79 |
| 2021 | 6.89 | 9.38 | 5.45 |
| 2020 | 6.17 | 7.91 | 4.69 |
| 2019 | 5.95 | 7.97 | 4.29 |
| 2018 | 7.47 | 9.06 | 5.87 |
| 2017 | 7.5 | 8.73 | 6.48 |
| 2016 | 8.77 | 12.8 | 7.31 |
| 2015 | 13.88 | 22.36 | 9.66 |
| 2014 | 12.79 | 17.63 | 9.69 |
| 2013 | 14.9 | 18.55 | 11.6 |
| 2012 | 14.93 | 19.3 | 11.18 |
| 2011 | 15.93 | 18.66 | 13.91 |