| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.67 | 6.22 | 4.43 |
| 2024 | 4.61 | 5.33 | 4.1 |
| 2023 | 5.63 | 6.93 | 4.36 |
| 2022 | 7.02 | 8.05 | 6.23 |
| 2021 | 8.29 | 10.89 | 6.81 |
| 2020 | 9.14 | 12.55 | 5.02 |
| 2019 | 5.45 | 6.88 | 4.35 |
| 2018 | 5.79 | 7.59 | 4.5 |
| 2017 | 6.55 | 7.85 | 5.84 |
| 2016 | 5.48 | 6.94 | 4.34 |
| 2015 | 6.51 | 11.59 | 2.77 |
| 2014 | 1.87 | 3.11 | 1.26 |
| 2013 | 1.51 | 2.64 | 1.06 |
| 2012 | 1.04 | 1.2 | 0.86 |
| 2011 | 2.26 | 3.37 | 0.97 |
| 2010 | 3.56 | 4.54 | 2.76 |
| 2009 | 4.06 | 5.03 | 3.11 |
| 2008 | 4.59 | 8.01 | 1.84 |
| 2007 | 3.64 | 5.43 | 2.14 |
| 2006 | 1.62 | 2.14 | 1.37 |
| 2005 | 2.12 | 2.55 | 1.78 |
| 2004 | 3.08 | 4.17 | 2.22 |