| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.53 | 4.14 | 1.68 |
| 2024 | 1.64 | 2.46 | 1.22 |
| 2023 | 2.06 | 2.54 | 1.73 |
| 2022 | 1.94 | 2.6 | 1.42 |
| 2021 | 2.7 | 4.65 | 1.37 |
| 2020 | 3.12 | 4.61 | 1.76 |
| 2019 | 1.59 | 5.21 | 0.1 |
| 2018 | 0.41 | 1.09 | 0.07 |
| 2017 | 7.8 | 12.54 | 1.05 |
| 2016 | 9.04 | 10.49 | 7.58 |
| 2015 | 8.65 | 17.17 | 4.59 |
| 2014 | 3.71 | 5.57 | 2.64 |
| 2013 | 2.99 | 3.39 | 2.48 |
| 2012 | 3.55 | 4.77 | 2.77 |
| 2011 | 5.45 | 8.32 | 3.15 |
| 2010 | 5.65 | 6.79 | 4.25 |
| 2009 | 5.02 | 6.57 | 3.4 |
| 2008 | 4.19 | 6.75 | 2.38 |