| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.67 | 5.07 | 4.3 |
| 2024 | 4.87 | 6.01 | 3.77 |
| 2023 | 4.23 | 6.72 | 2.84 |
| 2022 | 3.07 | 3.69 | 2.35 |
| 2021 | 5.48 | 9.41 | 3.07 |
| 2020 | 2.51 | 7.84 | 1.32 |
| 2019 | 1.76 | 2.14 | 1.38 |
| 2018 | 5.78 | 14.79 | 1.39 |
| 2017 | 8.96 | 13.76 | 6.45 |
| 2016 | 3.93 | 7.9 | 1.55 |
| 2015 | 2.61 | 4.47 | 1.79 |
| 2014 | 1.66 | 2.16 | 1.38 |
| 2013 | 1.63 | 2.02 | 1.37 |
| 2012 | 1.43 | 1.72 | 1.19 |
| 2011 | 2.09 | 2.59 | 1.32 |
| 2010 | 2.15 | 2.81 | 1.58 |
| 2009 | 1.79 | 2.7 | 1.13 |
| 2008 | 2.11 | 4.84 | 0.82 |
| 2007 | 2.66 | 4.09 | 1.79 |
| 2006 | 1.36 | 2.31 | 1.01 |
| 2005 | 1.22 | 1.55 | 0.93 |
| 2004 | 1.82 | 3.44 | 1.02 |