| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 9.82 | 12.04 | 8.4 |
| 2023 | 14.33 | 17.97 | 10.66 |
| 2022 | 18.34 | 27.91 | 12.62 |
| 2021 | 26.8 | 35.05 | 19.38 |
| 2020 | 15.31 | 23.56 | 10.44 |
| 2019 | 11.74 | 15.7 | 9.53 |
| 2018 | 12.74 | 17.65 | 9.17 |
| 2017 | 9.07 | 10.59 | 7.9 |
| 2016 | 7.83 | 9.56 | 6.08 |
| 2015 | 7.7 | 12.99 | 5.33 |
| 2014 | 5.33 | 6.51 | 4.62 |
| 2013 | 10.85 | 13.25 | 6.14 |
| 2012 | 9.87 | 13.01 | 7.69 |
| 2011 | 9.01 | 11.1 | 7.43 |
| 2010 | 7.88 | 13.72 | 5.59 |
| 2009 | 5.39 | 7.38 | 3.68 |
| 2008 | 5.32 | 9.54 | 3.15 |
| 2007 | 8.04 | 10.39 | 5.21 |
| 2006 | 4.61 | 6.42 | 3.73 |
| 2005 | 3.96 | 4.72 | 2.91 |
| 2004 | 3.12 | 3.76 | 2.48 |