| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.91 | 4.52 | 3.34 |
| 2024 | 3.68 | 5.23 | 2.84 |
| 2023 | 5.12 | 7.59 | 3.58 |
| 2022 | 8.44 | 12.84 | 5.54 |
| 2021 | 11.81 | 18.06 | 7.14 |
| 2020 | 6.79 | 9.08 | 5.25 |
| 2019 | 6.38 | 8.22 | 3.63 |
| 2018 | 5.86 | 8.47 | 3.63 |
| 2017 | 3.85 | 7.21 | 2.99 |
| 2016 | 4.11 | 5.32 | 3.28 |
| 2015 | 5.18 | 8.92 | 3.39 |
| 2014 | 4.29 | 5.19 | 3.66 |
| 2013 | 3.52 | 4.31 | 2.43 |
| 2012 | 2.7 | 3.74 | 2.15 |
| 2011 | 4.71 | 7.07 | 2.41 |
| 2010 | 6.58 | 8.09 | 4.7 |
| 2009 | 3.04 | 5.52 | 1.37 |
| 2008 | 2.69 | 5.32 | 1.03 |
| 2007 | 5.44 | 7.48 | 4.04 |
| 2006 | 4.85 | 6.2 | 4.08 |
| 2005 | 4.87 | 6.78 | 2.81 |
| 2004 | 6.72 | 13.22 | 3.29 |