| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.1 | 6.3 | 4.74 |
| 2024 | 5.14 | 7.87 | 3.9 |
| 2023 | 8.75 | 11.27 | 6.77 |
| 2022 | 7.21 | 11.68 | 4.96 |
| 2021 | 5.08 | 6.57 | 4.05 |
| 2020 | 3.58 | 5.44 | 1.93 |
| 2019 | 2.88 | 3.45 | 2.17 |
| 2018 | 3.14 | 4.49 | 2.23 |
| 2017 | 5.43 | 7.52 | 4.23 |
| 2016 | 6.04 | 7.39 | 5.17 |
| 2015 | 5.17 | 9.21 | 2.97 |
| 2014 | 2.68 | 3.34 | 1.93 |
| 2013 | 2.42 | 4.19 | 1.75 |
| 2012 | 2.13 | 2.59 | 1.7 |
| 2011 | 3 | 4.1 | 1.82 |
| 2010 | 4.13 | 5.41 | 3.36 |
| 2009 | 4.13 | 5.53 | 2.73 |
| 2008 | 6.6 | 13.47 | 2.21 |
| 2007 | 10.06 | 14.33 | 4.39 |
| 2006 | 2.52 | 4.72 | 1.09 |
| 2005 | 1.45 | 1.89 | 1.21 |
| 2004 | 2.26 | 4.23 | 1.45 |