| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 5.93 | 8.93 | 3.85 |
| 2023 | 7.3 | 9.07 | 5.65 |
| 2022 | 6.51 | 8.3 | 5.27 |
| 2021 | 11.35 | 17.56 | 6.77 |
| 2020 | 14.2 | 25.89 | 6.88 |
| 2019 | 5.24 | 7.59 | 3.98 |
| 2018 | 6.95 | 12.51 | 3.34 |
| 2017 | 17.09 | 27.55 | 9.41 |
| 2016 | 15.23 | 26.39 | 8.55 |
| 2015 | 7.04 | 10.41 | 4.88 |
| 2014 | 6.27 | 8.13 | 4.61 |
| 2013 | 5.08 | 7.1 | 3.88 |
| 2012 | 11.96 | 17.62 | 5.01 |
| 2011 | 16.31 | 23.62 | 9.08 |
| 2010 | 14.3 | 20.35 | 8.75 |
| 2009 | 10.18 | 20.3 | 2.78 |
| 2008 | 5.56 | 9.17 | 2.54 |
| 2007 | 5.85 | 8.51 | 2.61 |
| 2006 | 3.06 | 4.34 | 2.35 |
| 2005 | 3.14 | 4.11 | 2 |
| 2004 | 3.29 | 6.54 | 2.23 |