| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.63 | 7.25 | 6.05 |
| 2024 | 6.88 | 9.47 | 5.51 |
| 2023 | 15.45 | 21.69 | 8.5 |
| 2022 | 12.19 | 21.49 | 6.96 |
| 2021 | 6.78 | 10.49 | 5.04 |
| 2020 | 3.74 | 5.85 | 2.49 |
| 2019 | 3.49 | 4.42 | 2.97 |
| 2018 | 4.25 | 5.67 | 3.24 |
| 2017 | 6.95 | 9 | 5.3 |
| 2016 | 7.26 | 9.23 | 3.43 |
| 2015 | 5.1 | 7.74 | 2.72 |
| 2014 | 5.71 | 8.46 | 4.41 |
| 2013 | 4.58 | 5.31 | 4.18 |
| 2012 | 4.98 | 6.33 | 3.72 |
| 2011 | 8.91 | 16.23 | 4.79 |
| 2010 | 14.9 | 19.73 | 9.87 |
| 2009 | 8.42 | 10.93 | 5.13 |
| 2008 | 7.83 | 13.15 | 4 |
| 2007 | 11.12 | 14.56 | 6.66 |
| 2006 | 5.21 | 7.5 | 3.75 |
| 2005 | 4.25 | 5.87 | 3.54 |
| 2004 | 6.15 | 12.43 | 3.51 |