| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.23 | 9.29 | 7.52 |
| 2024 | 9 | 14.48 | 4.74 |
| 2023 | 8.85 | 18.35 | 4.31 |
| 2022 | 13.91 | 19.85 | 8.06 |
| 2021 | 15.21 | 19.07 | 11.47 |
| 2020 | 21.47 | 34.84 | 13.78 |
| 2019 | 23.17 | 32.98 | 15.55 |
| 2018 | 20.4 | 30.26 | 13.33 |
| 2017 | 35.68 | 51.24 | 29.05 |
| 2016 | 36.91 | 50.11 | 26.4 |
| 2015 | 33.68 | 68.04 | 16.53 |
| 2014 | 14.08 | 21.69 | 8.65 |
| 2013 | 7.98 | 8.24 | 7.85 |
| 2012 | 6.39 | 9.84 | 4.8 |
| 2011 | 9.21 | 12.83 | 4.73 |
| 2010 | 11.44 | 18 | 6.43 |
| 2009 | 6.1 | 6.43 | 5.99 |
| 2008 | 6.75 | 7.13 | 6.05 |
| 2007 | 7.68 | 8.27 | 6.47 |
| 2006 | 6.82 | 8.67 | 5.41 |
| 2005 | 3.96 | 7.12 | 2.12 |
| 2004 | 7.58 | 13.16 | 3.86 |