| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.48 | 2.79 | 2.07 |
| 2024 | 2.84 | 3.56 | 2.15 |
| 2023 | 4.05 | 4.82 | 2.95 |
| 2022 | 4.11 | 5.55 | 2.59 |
| 2021 | 6.08 | 10.02 | 3.26 |
| 2020 | 2.64 | 4.06 | 1.81 |
| 2019 | 2.08 | 2.7 | 1.67 |
| 2018 | 2.14 | 3.19 | 1.59 |
| 2017 | 4.2 | 6.02 | 2.92 |
| 2016 | 5.75 | 7.27 | 3.77 |
| 2015 | 4.31 | 8.14 | 2.19 |
| 2014 | 2.53 | 3.92 | 1.9 |
| 2013 | 5.58 | 13.19 | 2.15 |
| 2012 | 4.06 | 5.59 | 3.48 |
| 2011 | 5.08 | 6.89 | 3.1 |
| 2010 | 8.3 | 13.41 | 4.43 |
| 2009 | 6.13 | 12.76 | 2.28 |
| 2008 | 3.1 | 5.19 | 1.2 |