| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.92 | 4.82 | 3.44 |
| 2023 | 3.92 | 4.66 | 3.1 |
| 2022 | 3.28 | 3.65 | 2.69 |
| 2021 | 3.82 | 4.66 | 3.38 |
| 2020 | 4.9 | 6.23 | 3.51 |
| 2019 | 10.04 | 14.51 | 5.41 |
| 2018 | 8.98 | 12.24 | 6.54 |
| 2017 | 11.75 | 12.62 | 10.73 |
| 2016 | 8.79 | 12.51 | 5.94 |
| 2015 | 16.15 | 25.01 | 7.12 |
| 2014 | 12.44 | 24.83 | 10.04 |
| 2013 | 16.05 | 19.62 | 12.92 |
| 2012 | 11.64 | 15.14 | 6.71 |
| 2011 | 8.53 | 10.22 | 6.8 |
| 2010 | 12.31 | 20.96 | 7.86 |
| 2009 | 19.38 | 27.94 | 11.46 |
| 2008 | 19.87 | 30.47 | 9.39 |
| 2007 | 25.47 | 59.98 | 4.87 |
| 2006 | 16.36 | 524.78 | 6.81 |