| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.58 | 10.46 | 8.79 |
| 2024 | 9.3 | 11.73 | 6.31 |
| 2023 | 7.44 | 11.77 | 5.8 |
| 2022 | 6.06 | 8.7 | 4.11 |
| 2021 | 5.5 | 7.32 | 3.82 |
| 2020 | 6.31 | 9.7 | 5.24 |
| 2019 | 4.65 | 7.58 | 1.36 |
| 2018 | 1.74 | 2.42 | 1.2 |
| 2017 | 3.57 | 5.1 | 2.07 |
| 2016 | 4.99 | 5.66 | 3.68 |
| 2015 | 4.98 | 8.87 | 2.83 |
| 2014 | 2.59 | 4.76 | 2.1 |
| 2013 | 2.02 | 2.67 | 1.47 |
| 2012 | 1.24 | 1.83 | 0.95 |
| 2011 | 1.73 | 2.39 | 0.96 |
| 2010 | 2.21 | 2.85 | 1.63 |
| 2009 | 1.41 | 2.73 | 0.52 |
| 2008 | 0.88 | 1.46 | 0.39 |
| 2007 | 1.23 | 1.69 | 0.73 |
| 2006 | 0.9 | 1.25 | 0.68 |
| 2005 | 1.25 | 2.21 | 0.74 |
| 2004 | 2.2 | 4.05 | 1.34 |