| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.24 | 8.21 | 6.21 |
| 2024 | 5.65 | 8.2 | 3.82 |
| 2023 | 5.46 | 6.08 | 4.74 |
| 2022 | 6.83 | 9.35 | 5.42 |
| 2021 | 9.85 | 14.52 | 5.99 |
| 2020 | 4.46 | 7.99 | 3.01 |
| 2019 | 3.94 | 5.53 | 3.43 |
| 2018 | 4.79 | 6.46 | 3.55 |
| 2017 | 9.43 | 13.99 | 5.54 |
| 2016 | 8.34 | 13.65 | 6.2 |
| 2015 | 4.17 | 9.72 | 1.92 |
| 2014 | 1.77 | 2.38 | 1.36 |
| 2013 | 2.05 | 3.23 | 1.48 |
| 2012 | 1.57 | 2.46 | 1.05 |
| 2011 | 2.06 | 3.02 | 1.12 |
| 2010 | 2.55 | 3.22 | 1.76 |
| 2009 | 2.29 | 3.16 | 1.72 |
| 2008 | 11.52 | 24.62 | 1.53 |
| 2007 | 4.07 | 8.53 | 2.34 |
| 2006 | 1.44 | 3.85 | 0.48 |
| 2005 | 0.5 | 0.72 | 0.37 |
| 2004 | 0.95 | 1.95 | 0.5 |