| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.93 | 6.74 | 5.2 |
| 2024 | 5.1 | 7.4 | 3.5 |
| 2023 | 7.54 | 11.64 | 5.45 |
| 2022 | 10.6 | 15.24 | 7.37 |
| 2021 | 9.65 | 17.95 | 5.4 |
| 2020 | 9.39 | 13.54 | 6.61 |
| 2019 | 10.86 | 14.3 | 7.06 |
| 2018 | 9.46 | 15.22 | 6.47 |
| 2017 | 8.61 | 11.58 | 6.47 |
| 2016 | 8.66 | 14.09 | 6.91 |
| 2015 | 21.68 | 33.26 | 10.03 |
| 2014 | 15.16 | 25.76 | 9.98 |
| 2013 | 8.75 | 15.32 | 4.01 |
| 2012 | 4.59 | 6.22 | 2.95 |
| 2011 | 8.24 | 11.66 | 5.5 |
| 2010 | 11.08 | 15.15 | 7 |
| 2009 | 10.58 | 13.97 | 7.02 |