| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.46 | 8.2 | 6.71 |
| 2024 | 6.74 | 10.61 | 4.82 |
| 2023 | 13.43 | 21.59 | 8.73 |
| 2022 | 6.13 | 22.31 | 3.68 |
| 2021 | 4.67 | 6.72 | 3.19 |
| 2020 | 5.42 | 7.58 | 3.13 |
| 2019 | 4.31 | 6.75 | 3.53 |
| 2018 | 4.62 | 6.19 | 3.66 |
| 2017 | 7.55 | 10.18 | 5.62 |
| 2016 | 7.91 | 11.52 | 5.01 |
| 2015 | 8 | 15.15 | 5.52 |
| 2014 | 3.99 | 5.96 | 2.5 |
| 2013 | 2.06 | 2.8 | 1.55 |
| 2012 | 1.98 | 2.57 | 1.5 |
| 2011 | 3.3 | 4.44 | 2.05 |
| 2010 | 3.31 | 4.46 | 2.38 |
| 2009 | 2.18 | 3.05 | 1.4 |
| 2008 | 2.5 | 5.14 | 0.97 |
| 2007 | 3.67 | 5.03 | 2.6 |
| 2006 | 2.05 | 2.65 | 1.25 |
| 2005 | 1.16 | 1.43 | 0.85 |
| 2004 | 1.96 | 3.59 | 1.05 |