| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.46 | 5.84 | 4.09 |
| 2024 | 3.49 | 5.92 | 2.07 |
| 2023 | 2.91 | 3.57 | 1.91 |
| 2022 | 1.89 | 2.54 | 1.5 |
| 2021 | 2.13 | 2.85 | 1.75 |
| 2020 | 2.71 | 4.97 | 1.87 |
| 2019 | 2.33 | 3.58 | 1.73 |
| 2018 | 2.9 | 4.53 | 1.86 |
| 2017 | 6.51 | 8.98 | 4.19 |
| 2016 | 11.07 | 20.02 | 8.97 |
| 2015 | 15.4 | 26.08 | 9.04 |
| 2014 | 7.06 | 14.18 | 4.25 |
| 2013 | 3.75 | 6.58 | 1.77 |
| 2012 | 2.79 | 5.33 | 1.51 |
| 2011 | 6.39 | 13.14 | 3.49 |
| 2010 | 10.13 | 16.25 | 7.11 |
| 2009 | 7.43 | 12.28 | 2.89 |
| 2008 | 6.23 | 14.29 | 2.06 |
| 2007 | 11.08 | 15.88 | 7.19 |
| 2006 | 8.3 | 12.78 | 5.73 |
| 2005 | 4.31 | 5.75 | 2.29 |
| 2004 | 4.02 | 7.04 | 2.26 |