| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.88 | 4.08 | 3.61 |
| 2024 | 4.01 | 4.78 | 3.41 |
| 2023 | 5.22 | 5.89 | 4.18 |
| 2022 | 5.07 | 6 | 4.47 |
| 2021 | 6.32 | 8.73 | 5.45 |
| 2020 | 5.22 | 9.01 | 3.11 |
| 2019 | 4.04 | 4.6 | 3.46 |
| 2018 | 5.14 | 6.49 | 3.57 |
| 2017 | 5.22 | 5.84 | 4.68 |
| 2016 | 5.56 | 6.3 | 4.7 |
| 2015 | 6.35 | 8.75 | 4.71 |
| 2014 | 4.44 | 5.9 | 3.38 |
| 2013 | 4.5 | 5.79 | 3.7 |
| 2012 | 7.3 | 9.6 | 4.52 |
| 2011 | 9.93 | 11.49 | 8.72 |
| 2010 | 10.21 | 13.48 | 8.04 |
| 2009 | 8.28 | 10.7 | 6.88 |
| 2008 | 12.19 | 19.49 | 6.23 |
| 2007 | 14.27 | 18.66 | 11.81 |
| 2006 | 8.37 | 12.54 | 5.33 |
| 2005 | 3.31 | 5.36 | 1.62 |
| 2004 | 1.85 | 2.62 | 1.59 |