| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.75 | 5.07 | 4.06 |
| 2024 | 4.85 | 6.1 | 3.46 |
| 2023 | 6.18 | 7.98 | 4.56 |
| 2022 | 7.98 | 9.45 | 6.27 |
| 2021 | 7.33 | 9.9 | 5.57 |
| 2020 | 5.9 | 8.68 | 4.36 |
| 2019 | 5.84 | 7.3 | 4.93 |
| 2018 | 6.3 | 8.02 | 5.05 |
| 2017 | 9.43 | 12.03 | 6.98 |
| 2016 | 12.07 | 16.26 | 10.03 |
| 2015 | 12.95 | 20.96 | 7.28 |
| 2014 | 6.06 | 8.76 | 4.79 |
| 2013 | 5.05 | 6.62 | 3.84 |
| 2012 | 4.6 | 6.32 | 3.17 |
| 2011 | 7.77 | 10.78 | 5.52 |
| 2010 | 6.04 | 13.51 | 3.03 |
| 2009 | 7.35 | 10.35 | 2.74 |
| 2008 | 7.31 | 12.66 | 3.51 |
| 2007 | 8.13 | 14 | 3.33 |
| 2006 | 3.19 | 4.75 | 1.67 |
| 2005 | 1.88 | 2.82 | 1.01 |
| 2004 | 2.25 | 4 | 1.47 |