| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.59 | 3.77 | 1.7 |
| 2024 | 1.49 | 2.39 | 1.15 |
| 2023 | 1.82 | 2.42 | 1.54 |
| 2022 | 1.9 | 2.66 | 1.5 |
| 2021 | 2.53 | 3.09 | 2.12 |
| 2020 | 4.14 | 5.83 | 2.8 |
| 2019 | 2.82 | 3.84 | 2.24 |
| 2018 | 3.5 | 4.36 | 2.47 |
| 2017 | 4.94 | 5.98 | 3.62 |
| 2016 | 6.53 | 7.64 | 5.14 |
| 2015 | 8.14 | 13.47 | 5.11 |
| 2014 | 6.07 | 8.35 | 3.17 |
| 2013 | 4.5 | 5.93 | 3.12 |
| 2012 | 4.24 | 5.26 | 2.73 |
| 2011 | 5.68 | 7.47 | 4.68 |
| 2010 | 7.16 | 9.01 | 5.94 |
| 2009 | 5.46 | 7.38 | 3.94 |
| 2008 | 4.96 | 8.62 | 2.32 |
| 2007 | 5.77 | 7.27 | 4.45 |