| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.88 | 4.9 | 3.12 |
| 2023 | 4.72 | 6.91 | 3.63 |
| 2022 | 4.39 | 7.07 | 3.36 |
| 2021 | 8.6 | 13.42 | 5.76 |
| 2020 | 11.63 | 33.82 | 4.58 |
| 2019 | 5.5 | 7.46 | 4.48 |
| 2018 | 6.63 | 9.48 | 4.86 |
| 2017 | 8.77 | 12.22 | 6.35 |
| 2016 | 7.26 | 12.69 | 3.07 |
| 2015 | 3.78 | 4.97 | 2.29 |
| 2014 | 2.74 | 4.01 | 1.98 |
| 2013 | 2.04 | 2.32 | 1.79 |
| 2012 | 1.6 | 1.9 | 1.36 |
| 2011 | 1.91 | 2.35 | 1.44 |
| 2010 | 1.83 | 2.49 | 1.23 |
| 2009 | 1.37 | 1.93 | 0.86 |
| 2008 | 1.39 | 2.8 | 0.61 |
| 2007 | 2.77 | 3.61 | 1.73 |
| 2006 | 1.87 | 2.9 | 1.11 |
| 2005 | 2.49 | 5.51 | 1.17 |
| 2004 | 7.45 | 13.28 | 4.34 |