| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.25 | 1.51 | 0.96 |
| 2023 | 1.1 | 1.48 | 0.91 |
| 2022 | 0.98 | 1.19 | 0.8 |
| 2021 | 1.07 | 1.26 | 0.96 |
| 2020 | 1.21 | 1.71 | 1 |
| 2019 | 1.53 | 1.89 | 1.25 |
| 2018 | 1.46 | 1.75 | 1.09 |
| 2017 | 1.91 | 2.64 | 1.64 |
| 2016 | 10.43 | 27.1 | 2.13 |
| 2015 | 8.39 | 12.51 | 3.27 |
| 2014 | 3.24 | 4.35 | 2.45 |
| 2013 | 3.07 | 4.33 | 2.55 |
| 2012 | 3.27 | 4.45 | 2.19 |
| 2011 | 5.88 | 7.48 | 3.02 |
| 2010 | 5.94 | 8.45 | 4.46 |
| 2009 | 5.2 | 7.47 | 1.91 |
| 2008 | 4.38 | 13.43 | 1.2 |
| 2007 | 6.99 | 14.36 | 1.82 |
| 2006 | 1.92 | 2.49 | 1.5 |
| 2005 | 1.76 | 2.36 | 1.35 |