| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.1 | 3.89 | 2.51 |
| 2024 | 2.12 | 3.44 | 1.5 |
| 2023 | 1.97 | 2.42 | 1.68 |
| 2022 | 1.97 | 2.62 | 1.32 |
| 2021 | 2.06 | 3.21 | 1.51 |
| 2020 | 2.12 | 3.59 | 1.4 |
| 2019 | 1.83 | 2.5 | 1.29 |
| 2018 | 4.08 | 10.35 | 1.2 |
| 2017 | 9.23 | 13.74 | 6.51 |
| 2016 | 8.55 | 10.38 | 5.84 |
| 2015 | 8.47 | 14.31 | 5.54 |
| 2014 | 4.39 | 7.8 | 2.93 |
| 2013 | 3.32 | 4.49 | 2.49 |
| 2012 | 3.5 | 4.22 | 2.33 |
| 2011 | 4.49 | 7.64 | 2.51 |
| 2010 | 6.4 | 8.2 | 4.86 |
| 2009 | 4.37 | 5.28 | 3.12 |
| 2008 | 4.33 | 7.75 | 1.75 |
| 2007 | 7.11 | 9.07 | 5.64 |
| 2006 | 5.46 | 6.69 | 4.28 |