| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 5.3 | 6.07 | 4.93 |
| 2025 | 4.96 | 5.98 | 4.44 |
| 2024 | 4.55 | 5.71 | 3.72 |
| 2023 | 5.72 | 7.93 | 4.65 |
| 2022 | 5.61 | 7.51 | 4.37 |
| 2021 | 4.85 | 6.75 | 3.38 |
| 2020 | 4.16 | 5.73 | 3.09 |
| 2019 | 4.05 | 6.74 | 2.36 |
| 2018 | 3.3 | 4.41 | 2.21 |
| 2017 | 4.05 | 5.19 | 3.08 |
| 2016 | 5.06 | 9.67 | 3.41 |
| 2015 | 7 | 11.44 | 4.34 |
| 2014 | 3.48 | 5.52 | 2.64 |
| 2013 | 3.32 | 4.44 | 2.42 |
| 2012 | 3.29 | 4.23 | 2.44 |
| 2011 | 6.44 | 12.6 | 3.44 |
| 2010 | 7.59 | 12.55 | 5.05 |
| 2009 | 4.76 | 7.4 | 3.64 |
| 2008 | 4.24 | 6.6 | 2.19 |
| 2007 | 2.6 | 4.02 | 1.68 |
| 2006 | 1.55 | 2.18 | 0.8 |
| 2005 | 0.83 | 1.13 | 0.64 |