| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 9.11 | 10.11 | 7.78 |
| 2023 | 11.14 | 16.42 | 7.96 |
| 2022 | 15.04 | 18.15 | 12.1 |
| 2021 | 21.74 | 30.27 | 16.49 |
| 2020 | 11.12 | 24.91 | 6 |
| 2019 | 5.8 | 7.42 | 3.54 |
| 2018 | 6.62 | 9.67 | 3.36 |
| 2017 | 6.68 | 9.08 | 4.77 |
| 2016 | 4.18 | 5.22 | 3.23 |
| 2015 | 4.55 | 6.44 | 3.13 |
| 2014 | 3 | 5.41 | 2.06 |
| 2013 | 3.46 | 5.96 | 2.22 |
| 2012 | 6.31 | 7.41 | 4.58 |
| 2011 | 8.14 | 10.14 | 6.1 |
| 2010 | 8.85 | 12.54 | 6.85 |
| 2009 | 5.83 | 8.88 | 2.93 |
| 2008 | 4.65 | 10.15 | 2.46 |
| 2007 | 10.16 | 13.93 | 7.55 |
| 2006 | 5.09 | 9.62 | 3.04 |
| 2005 | 2.9 | 3.63 | 2.15 |
| 2004 | 2.94 | 4.89 | 2.17 |