| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.78 | 5.07 | 1.17 |
| 2023 | 1.7 | 1.99 | 1.51 |
| 2022 | 1.54 | 2 | 1.15 |
| 2021 | 1.95 | 2.51 | 1.68 |
| 2020 | 1.67 | 2.07 | 1.35 |
| 2019 | 1.68 | 2.59 | 1.26 |
| 2018 | 2.23 | 3.23 | 1.28 |
| 2017 | 4.15 | 5.13 | 3.02 |
| 2016 | 5.47 | 7.26 | 4.85 |
| 2015 | 6.98 | 11.11 | 4.53 |
| 2014 | 4.14 | 5.36 | 3.1 |
| 2013 | 4.49 | 6.35 | 2.99 |
| 2012 | 6.7 | 8.25 | 4.47 |
| 2011 | 8.6 | 13.09 | 5.65 |
| 2010 | 9.63 | 14.85 | 6.33 |
| 2009 | 6.37 | 9.46 | 3.24 |
| 2008 | 4.01 | 7.85 | 1.65 |