| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.5 | 3.76 | 3.11 |
| 2024 | 3.56 | 5.22 | 2.31 |
| 2023 | 5.73 | 8.27 | 4.41 |
| 2022 | 9.56 | 14.7 | 6.07 |
| 2021 | 15.55 | 25.26 | 8.32 |
| 2020 | 6.45 | 9.68 | 5.21 |
| 2019 | 5.59 | 7.08 | 3.12 |
| 2018 | 5.38 | 8.74 | 3.12 |
| 2017 | 3.84 | 7.44 | 2.92 |
| 2016 | 3.38 | 4.3 | 2.55 |
| 2015 | 4.08 | 7.04 | 2.71 |
| 2014 | 3.2 | 3.73 | 2.54 |
| 2013 | 2.79 | 3.57 | 1.91 |
| 2012 | 2.33 | 3.38 | 1.7 |
| 2011 | 4.31 | 6.32 | 2.23 |
| 2010 | 7.9 | 11.68 | 5.75 |
| 2009 | 3.55 | 6.07 | 1.86 |
| 2008 | 3.38 | 7.08 | 1.4 |
| 2007 | 6.87 | 9.23 | 5.38 |
| 2006 | 5.58 | 6.97 | 4.3 |
| 2005 | 4.93 | 6.49 | 3.71 |
| 2004 | 6.39 | 9.61 | 4.2 |