| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.54 | 6.7 | 3.22 |
| 2023 | 4.7 | 7.32 | 3.4 |
| 2022 | 11.09 | 21.49 | 6.03 |
| 2021 | 17.45 | 21.86 | 13.42 |
| 2020 | 1.73 | 2.69 | 1.04 |
| 2019 | 1.08 | 1.36 | 0.8 |
| 2018 | 2.39 | 4.23 | 1.17 |
| 2017 | 3.35 | 5.49 | 2.52 |
| 2016 | 3.18 | 3.77 | 2.62 |
| 2015 | 3.83 | 5.39 | 2.51 |
| 2014 | 3.21 | 4.08 | 2.66 |
| 2013 | 4.29 | 6.51 | 3.02 |
| 2012 | 7.52 | 9.87 | 5.01 |
| 2011 | 13.4 | 19.77 | 6.66 |
| 2010 | 8.6 | 13.3 | 6.07 |
| 2009 | 9.41 | 12.82 | 6.85 |
| 2008 | 20.79 | 25.37 | 10.28 |
| 2007 | 12 | 20.68 | 7.61 |
| 2006 | 7.83 | 10.62 | 5.2 |
| 2005 | 5.61 | 7.53 | 4.42 |
| 2004 | 9.47 | 14.86 | 5.52 |