| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.76 | 7.06 | 2.32 |
| 2024 | 1.83 | 3.89 | 0.61 |
| 2023 | 1.55 | 3.5 | 0.82 |
| 2022 | 2.38 | 2.88 | 2.03 |
| 2021 | 1.65 | 2.37 | 1.24 |
| 2020 | 2.8 | 3.78 | 1.84 |
| 2019 | 2.6 | 3.3 | 1.88 |
| 2018 | 3.01 | 5.26 | 1.58 |
| 2017 | 6.26 | 8.1 | 4.81 |
| 2016 | 5.53 | 8.97 | 3.21 |
| 2015 | 9.69 | 16.42 | 5.44 |
| 2014 | 4.21 | 6.35 | 2.4 |
| 2013 | 4.01 | 9.23 | 2.27 |
| 2012 | 5.79 | 7.62 | 3.19 |
| 2011 | 4.08 | 5.24 | 2.88 |
| 2010 | 8.06 | 26.91 | 2.72 |
| 2009 | 5.75 | 26.43 | 1.77 |
| 2008 | 2.4 | 4.01 | 1.32 |
| 2007 | 2.59 | 3.77 | 1.13 |
| 2006 | 1.35 | 1.65 | 1.06 |
| 2005 | 1.33 | 2.17 | 0.87 |
| 2004 | 1.26 | 1.73 | 0.94 |