| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.38 | 5.67 | 3.8 |
| 2024 | 3.25 | 4.49 | 2.29 |
| 2023 | 3.79 | 4.51 | 3.08 |
| 2022 | 4.11 | 5.15 | 3.36 |
| 2021 | 4.49 | 6.58 | 3.77 |
| 2020 | 7.33 | 15.97 | 4.31 |
| 2019 | 5.4 | 6.76 | 4.5 |
| 2018 | 5.7 | 8.07 | 4.24 |
| 2017 | 8.06 | 10.32 | 6.57 |
| 2016 | 13.57 | 19.04 | 8.96 |
| 2015 | 15.66 | 20.69 | 9.03 |
| 2014 | 9.62 | 17.78 | 6.1 |
| 2013 | 11.34 | 20.39 | 6.38 |
| 2012 | 7.65 | 9.25 | 5.51 |
| 2011 | 10.47 | 14.01 | 6.4 |
| 2010 | 11.41 | 17.33 | 7.49 |
| 2009 | 5.01 | 8.86 | 1.12 |
| 2008 | 1.75 | 3.05 | 0.85 |
| 2007 | 2.29 | 3.2 | 1.16 |
| 2006 | 1.2 | 1.41 | 0.97 |
| 2005 | 1.31 | 1.67 | 0.93 |
| 2004 | 2.11 | 2.9 | 1.61 |