| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.94 | 6.93 | 3.35 |
| 2024 | 6.93 | 12.09 | 4.13 |
| 2023 | 9.2 | 12.48 | 5.6 |
| 2022 | 6.23 | 9.55 | 3.8 |
| 2021 | 4.46 | 6.68 | 3.09 |
| 2020 | 4.92 | 6.92 | 3.05 |
| 2019 | 3.08 | 5.4 | 1.92 |
| 2018 | 2.55 | 3.74 | 1.66 |
| 2017 | 3.27 | 4.18 | 2.48 |
| 2016 | 5.06 | 7.39 | 3.8 |
| 2015 | 4.6 | 7.7 | 2.66 |
| 2014 | 3.7 | 5.69 | 2.85 |
| 2013 | 2.32 | 3.77 | 1.56 |
| 2012 | 2.41 | 4.49 | 1.48 |
| 2011 | 6.13 | 13.66 | 3.12 |
| 2010 | 7.03 | 12.3 | 4.12 |
| 2009 | 4.13 | 5.93 | 1.84 |
| 2008 | 2.71 | 4.12 | 1.35 |
| 2007 | 3.17 | 4.42 | 1.2 |
| 2006 | 1.14 | 1.74 | 0.78 |
| 2005 | 0.96 | 1.26 | 0.7 |
| 2004 | 1.84 | 3.3 | 0.8 |