| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.84 | 5.37 | 4.07 |
| 2024 | 4.3 | 6.18 | 3.17 |
| 2023 | 6.05 | 7.34 | 5.27 |
| 2022 | 6.01 | 7.33 | 5.01 |
| 2021 | 6.46 | 7.44 | 5.7 |
| 2020 | 10.19 | 20.06 | 7.19 |
| 2019 | 12.4 | 17.08 | 9.39 |
| 2018 | 12.54 | 16.88 | 9.29 |
| 2017 | 21.25 | 29.13 | 16.74 |
| 2016 | 24.07 | 31.07 | 16.11 |
| 2015 | 19.52 | 32.43 | 10.06 |
| 2014 | 9.42 | 12.32 | 6.19 |
| 2013 | 6.91 | 8.1 | 6.13 |
| 2012 | 5.86 | 7.22 | 4.85 |
| 2011 | 10.94 | 12.33 | 9.55 |
| 2010 | 10.53 | 14.44 | 6.54 |
| 2009 | 4.93 | 7.29 | 2.33 |
| 2008 | 3.44 | 5.41 | 1.43 |
| 2007 | 4.2 | 5.92 | 2.6 |
| 2006 | 2.53 | 3.93 | 1.6 |
| 2005 | 1.68 | 2.05 | 1.36 |