| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.91 | 3.62 | 2.38 |
| 2024 | 2.47 | 3.07 | 1.87 |
| 2023 | 4.16 | 6.31 | 2.71 |
| 2022 | 4.81 | 6.97 | 2.91 |
| 2021 | 3.49 | 5.3 | 2.35 |
| 2020 | 2.86 | 3.48 | 2.26 |
| 2019 | 3.64 | 6.04 | 2.31 |
| 2018 | 4.33 | 8.92 | 2.68 |
| 2017 | 9.73 | 11.51 | 8.07 |
| 2016 | 10.53 | 12.57 | 8.47 |
| 2015 | 14.2 | 26.55 | 7.35 |
| 2014 | 9.16 | 13.05 | 7.13 |
| 2013 | 7.73 | 9.71 | 6.02 |
| 2012 | 6.79 | 9.24 | 4.78 |
| 2011 | 7.38 | 8.41 | 3.98 |
| 2010 | 6.91 | 9.62 | 4.56 |
| 2009 | 7.58 | 9.36 | 3.77 |
| 2008 | 6.71 | 12.94 | 2.16 |
| 2007 | 6.18 | 10.74 | 2.35 |
| 2006 | 2.36 | 3.07 | 1.62 |
| 2005 | 1.78 | 2.61 | 1.08 |
| 2004 | 2.94 | 4.13 | 2.34 |