| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.88 | 8.25 | 7.41 |
| 2024 | 6.29 | 8.75 | 5.27 |
| 2023 | 9.61 | 13.01 | 6.62 |
| 2022 | 8.95 | 13.54 | 6.19 |
| 2021 | 5.16 | 10.1 | 2.61 |
| 2020 | 2.38 | 4.06 | 1.37 |
| 2019 | 1.72 | 2.88 | 1.21 |
| 2018 | 3.24 | 4.15 | 1.94 |
| 2017 | 5.13 | 8.8 | 3.43 |
| 2016 | 9.68 | 25.98 | 3.35 |
| 2015 | 4.96 | 6.25 | 2.94 |
| 2014 | 3.4 | 4.74 | 2.82 |
| 2013 | 4.29 | 6.69 | 3.42 |
| 2012 | 3.96 | 5.75 | 2.26 |
| 2011 | 4.32 | 5.26 | 2.51 |
| 2010 | 6.47 | 10.52 | 4.69 |
| 2009 | 4.95 | 7.55 | 2.09 |
| 2008 | 4.24 | 7.41 | 1.61 |
| 2007 | 5.08 | 8.98 | 1.74 |
| 2006 | 1.34 | 1.82 | 0.84 |
| 2005 | 1.58 | 2.17 | 1.08 |
| 2004 | 2.95 | 4.13 | 1.7 |