| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.46 | 6.28 | 4.93 |
| 2024 | 5.54 | 7.61 | 4.74 |
| 2023 | 6.4 | 8.25 | 5.11 |
| 2022 | 8.13 | 10.41 | 6.14 |
| 2021 | 4.04 | 12.53 | 1.87 |
| 2020 | 6.36 | 11.99 | 3.13 |
| 2019 | 1.81 | 4.47 | 0.85 |
| 2018 | 3.6 | 4.89 | 1.41 |
| 2017 | 4.38 | 4.8 | 4.02 |
| 2016 | 3.85 | 4.46 | 3.1 |
| 2015 | 4.26 | 6.6 | 2.3 |
| 2014 | 2.49 | 3.35 | 2.14 |
| 2013 | 3.55 | 4.14 | 3.04 |
| 2012 | 4.42 | 5.67 | 2.84 |
| 2011 | 8.25 | 12.85 | 4.41 |
| 2010 | 10.03 | 13.48 | 7.88 |
| 2009 | 6.77 | 9.07 | 4.27 |
| 2008 | 4.92 | 7.36 | 2.88 |
| 2007 | 5.8 | 8.13 | 3.41 |
| 2006 | 2.71 | 4.14 | 1.68 |
| 2005 | 1.82 | 2.34 | 1.2 |
| 2004 | 2.24 | 4.27 | 1.29 |