| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.75 | 4.42 | 3.19 |
| 2024 | 3.34 | 4.28 | 2.58 |
| 2023 | 3.98 | 4.73 | 3.34 |
| 2022 | 4.49 | 6.75 | 3.22 |
| 2021 | 3.09 | 5.88 | 1.95 |
| 2020 | 2.44 | 3.37 | 1.77 |
| 2019 | 2.13 | 2.82 | 1.69 |
| 2018 | 2.16 | 2.84 | 1.62 |
| 2017 | 7.15 | 18.2 | 2.08 |
| 2016 | 8.98 | 11.29 | 6.2 |
| 2015 | 8.47 | 10.92 | 4.75 |
| 2014 | 4.77 | 6.66 | 3.39 |
| 2013 | 9.02 | 28.45 | 4.6 |
| 2012 | 6.34 | 9.39 | 3.34 |
| 2011 | 7.17 | 10.15 | 3.58 |
| 2010 | 11.21 | 15.84 | 8.23 |
| 2009 | 6.32 | 12.81 | 1.71 |
| 2008 | 3.82 | 8.5 | 1.39 |
| 2007 | 7.17 | 10.55 | 4.36 |
| 2006 | 4.87 | 6.01 | 4.06 |
| 2005 | 5.43 | 7.39 | 3.26 |
| 2004 | 4.77 | 8.67 | 3.16 |