| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.92 | 4.27 | 3.41 |
| 2023 | 4.28 | 4.93 | 3.9 |
| 2022 | 4.16 | 4.93 | 3.46 |
| 2021 | 5.03 | 6.26 | 4.52 |
| 2020 | 6.3 | 7.53 | 4.75 |
| 2019 | 10.18 | 13.78 | 5.7 |
| 2018 | 8.02 | 9.86 | 5.83 |
| 2017 | 10.83 | 11.87 | 8.94 |
| 2016 | 9.12 | 14.29 | 6.11 |
| 2015 | 16.5 | 27.56 | 6.34 |
| 2014 | 12.01 | 30.84 | 8.55 |
| 2013 | 12.06 | 15.64 | 9.77 |
| 2012 | 11.65 | 14.42 | 7.79 |
| 2011 | 10.78 | 13.51 | 7.88 |
| 2010 | 13.13 | 22.39 | 8.73 |
| 2009 | 21.94 | 35.03 | 15 |
| 2008 | 13.67 | 15.24 | 12.28 |
| 2007 | 12.62 | 22.05 | 0.76 |
| 2006 | 1.12 | 1.77 | 0.6 |