| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.96 | 4.05 | 2.05 |
| 2024 | 1.68 | 3.19 | 1.25 |
| 2023 | 1.81 | 2.32 | 1.27 |
| 2022 | 1.36 | 1.78 | 1.16 |
| 2021 | 1.23 | 1.54 | 0.91 |
| 2020 | 1.64 | 2.02 | 1.21 |
| 2019 | 2.22 | 3.3 | 1.73 |
| 2018 | 2.49 | 3.27 | 1.7 |
| 2017 | 3.25 | 4.25 | 2.66 |
| 2016 | 4.25 | 6.73 | 3.43 |
| 2015 | 8.27 | 16.2 | 3.83 |
| 2014 | 10.52 | 35.47 | 3.59 |
| 2013 | 3.46 | 4.4 | 2.44 |
| 2012 | 4.42 | 6.08 | 2.62 |
| 2011 | 6.14 | 8.15 | 5.32 |
| 2010 | 5.69 | 6.89 | 4.52 |
| 2009 | 5.01 | 6.39 | 3.32 |
| 2008 | 3.89 | 5.56 | 2.17 |