| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.15 | 3.04 | 1.62 |
| 2023 | 2.06 | 2.53 | 1.67 |
| 2022 | 3.99 | 7.41 | 1.82 |
| 2021 | 6.14 | 8.01 | 4.72 |
| 2020 | 5.93 | 9.49 | 3.13 |
| 2019 | 2.53 | 4.55 | 1.39 |
| 2018 | 2.36 | 4.03 | 1.44 |
| 2017 | 4.79 | 6.07 | 3.82 |
| 2016 | 4.46 | 5.47 | 3.74 |
| 2015 | 5.68 | 7.92 | 3.53 |
| 2014 | 6.41 | 9.87 | 5.07 |
| 2013 | 9.41 | 12.72 | 5.99 |
| 2012 | 7.25 | 10.96 | 4.87 |
| 2011 | 10.75 | 13.64 | 8.68 |
| 2010 | 11.42 | 15.28 | 7.64 |
| 2009 | 5.4 | 8.31 | 4.04 |