| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.51 | 4.19 | 3.12 |
| 2024 | 3.05 | 4.24 | 2.09 |
| 2023 | 3.76 | 4.24 | 3.27 |
| 2022 | 4 | 5.46 | 3.18 |
| 2021 | 4.19 | 5.77 | 3.4 |
| 2020 | 5.79 | 8.44 | 3.54 |
| 2019 | 3.63 | 5.22 | 3.09 |
| 2018 | 4.65 | 6.81 | 2.85 |
| 2017 | 8.18 | 11.28 | 6.27 |
| 2016 | 11.63 | 19.6 | 9.64 |
| 2015 | 28.22 | 52.64 | 14.25 |
| 2014 | 9.52 | 13.89 | 6.98 |
| 2013 | 8.18 | 11.14 | 6.43 |
| 2012 | 9.71 | 13.11 | 6.42 |
| 2011 | 19.69 | 25.97 | 11.24 |
| 2010 | 20.8 | 26.15 | 13.23 |
| 2009 | 18.65 | 27.21 | 11.78 |
| 2008 | 12.42 | 17.01 | 7.02 |