| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.16 | 8.92 | 6.63 |
| 2024 | 4.2 | 7.95 | 2.07 |
| 2023 | 5.38 | 7.74 | 2.53 |
| 2022 | 9.29 | 12.52 | 7.09 |
| 2021 | 11.45 | 21.78 | 6.5 |
| 2020 | 5.75 | 11.05 | 4.08 |
| 2019 | 5.45 | 8.98 | 3.63 |
| 2018 | 3.79 | 4.86 | 3.12 |
| 2017 | 5.48 | 8.69 | 3.37 |
| 2016 | 4.48 | 8.08 | 2.15 |
| 2015 | 3.07 | 5.31 | 1.95 |
| 2014 | 1.95 | 3.46 | 1.32 |
| 2013 | 2.44 | 3.98 | 1.62 |
| 2012 | 7.1 | 11.12 | 2.9 |
| 2011 | 7.26 | 11.14 | 5.1 |
| 2010 | 6.46 | 10.19 | 4.55 |
| 2009 | 4.79 | 6.43 | 3.41 |
| 2008 | 8.21 | 16.19 | 3.37 |
| 2007 | 10.04 | 16.55 | 4.1 |
| 2006 | 4.58 | 7.11 | 3.66 |
| 2005 | 3.94 | 5.87 | 2.14 |
| 2004 | 4.77 | 7.22 | 2.59 |