| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.11 | 6.44 | 4.53 |
| 2024 | 3.85 | 6.88 | 2.89 |
| 2023 | 3.78 | 5.16 | 3.07 |
| 2022 | 3.2 | 3.71 | 2.74 |
| 2021 | 3.45 | 4.76 | 2.81 |
| 2020 | 4.5 | 6.05 | 3.25 |
| 2019 | 4.07 | 6.21 | 3.07 |
| 2018 | 3.69 | 5.64 | 2.57 |
| 2017 | 5.25 | 6.46 | 3.87 |
| 2016 | 5.73 | 6.93 | 4.64 |
| 2015 | 7.95 | 14.76 | 4.91 |
| 2014 | 5.41 | 7.64 | 4.18 |
| 2013 | 3.73 | 6.73 | 2.56 |
| 2012 | 2.97 | 3.59 | 2.37 |
| 2011 | 3.36 | 4.11 | 2.62 |
| 2010 | 4.46 | 5.76 | 3.61 |
| 2009 | 3.61 | 4.4 | 2.93 |
| 2008 | 5.6 | 10.89 | 2.31 |
| 2007 | 4.77 | 8.82 | 1.17 |
| 2006 | 0.89 | 1.28 | 0.35 |
| 2005 | 0.29 | 0.4 | 0.16 |
| 2004 | 0.37 | 0.54 | 0.25 |