| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.95 | 6.95 | 3.38 |
| 2024 | 3.93 | 6.35 | 2.72 |
| 2023 | 7.54 | 10.77 | 5.76 |
| 2022 | 8.92 | 14.71 | 6.39 |
| 2021 | 13.76 | 20.58 | 11.34 |
| 2020 | 15.02 | 20.49 | 8.99 |
| 2019 | 8.4 | 11.23 | 5.48 |
| 2018 | 7.08 | 10.5 | 5.26 |
| 2017 | 5.41 | 6.91 | 3.99 |
| 2016 | 6.89 | 9.86 | 5.46 |
| 2015 | 11.92 | 22.69 | 6.67 |
| 2014 | 4.54 | 7.64 | 3.15 |
| 2013 | 2.61 | 3.6 | 1.98 |
| 2012 | 3.39 | 4.24 | 1.81 |
| 2011 | 5.58 | 7.22 | 3.85 |
| 2010 | 8.08 | 9.88 | 6.84 |
| 2009 | 6.86 | 9.02 | 5.93 |
| 2008 | 8.39 | 11.89 | 4.77 |
| 2007 | 8.86 | 11.1 | 6.23 |
| 2006 | 4.61 | 6.86 | 3.09 |
| 2005 | 3.36 | 4.42 | 2.44 |
| 2004 | 4.09 | 7.17 | 2.71 |