| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.49 | 1.7 | 1.25 |
| 2024 | 1.47 | 1.97 | 0.97 |
| 2023 | 2.54 | 3.32 | 1.81 |
| 2022 | 4.04 | 5.72 | 2.97 |
| 2021 | 11.71 | 25.19 | 3.63 |
| 2020 | 4.14 | 11.41 | 1.43 |
| 2019 | 2.09 | 3.29 | 1.28 |
| 2018 | 2.86 | 3.72 | 2.13 |
| 2017 | 6.25 | 8.47 | 3.44 |
| 2016 | 5.91 | 8.91 | 4.03 |
| 2015 | 7.44 | 10.25 | 3.33 |
| 2014 | 3.38 | 4.27 | 2.67 |
| 2013 | 3.86 | 5.35 | 3.02 |
| 2012 | 3.35 | 4.27 | 2.86 |
| 2011 | 6.51 | 10.64 | 2.99 |
| 2010 | 9.94 | 12.32 | 7.73 |
| 2009 | 8.31 | 12.99 | 3.7 |
| 2008 | 11.35 | 27.08 | 2.6 |
| 2007 | 16.13 | 26.3 | 5.41 |
| 2006 | 6.82 | 9.78 | 4.59 |
| 2005 | 6.06 | 7.5 | 3.56 |
| 2004 | 6.62 | 14.09 | 3.92 |