| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.29 | 2.81 | 1.92 |
| 2024 | 1.71 | 2.97 | 1.33 |
| 2023 | 2.17 | 2.58 | 1.75 |
| 2022 | 2.59 | 3.65 | 2.13 |
| 2021 | 4.29 | 5.79 | 3.35 |
| 2020 | 8.18 | 11.7 | 5.33 |
| 2019 | 6.9 | 8.61 | 5.26 |
| 2018 | 8.36 | 14.68 | 4.71 |
| 2017 | 12.65 | 15.67 | 10.65 |
| 2016 | 16.95 | 34.14 | 11.24 |
| 2015 | 12.37 | 20.45 | 8 |
| 2014 | 7.95 | 15.2 | 3.93 |
| 2013 | 2.35 | 4.02 | 1.45 |
| 2012 | 1.85 | 2.46 | 1.39 |
| 2011 | 3.74 | 5.89 | 1.88 |
| 2010 | 4.71 | 8.53 | 3.14 |
| 2009 | 3.03 | 4.69 | 1.75 |
| 2008 | 2.2 | 3.71 | 1.22 |