| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.5 | 5.74 | 5.3 |
| 2024 | 6.18 | 6.87 | 5.24 |
| 2023 | 7.29 | 8.97 | 6.14 |
| 2022 | 8.71 | 13.55 | 6.82 |
| 2021 | 16.27 | 19.97 | 11.37 |
| 2020 | 21.15 | 26.32 | 15.54 |
| 2019 | 19.33 | 28.77 | 15.26 |
| 2018 | 47.58 | 52.73 | 17.19 |
| 2017 | 46.35 | 53.81 | 42.9 |
| 2016 | 50.38 | 55.58 | 47.61 |
| 2015 | 66.04 | 89.81 | 52.25 |
| 2014 | 55.88 | 81.7 | 31.17 |
| 2013 | 17.44 | 37.63 | 10.96 |
| 2012 | 11.61 | 14.8 | 9.62 |
| 2011 | 15.06 | 20.41 | 11.75 |
| 2010 | 19.86 | 24.86 | 15.67 |
| 2009 | 15.19 | 18.61 | 13.12 |
| 2008 | 12.4 | 16.24 | 4.96 |