| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.13 | 4.49 | 2.42 |
| 2024 | 1.84 | 3.71 | 1.07 |
| 2023 | 1.53 | 1.99 | 1.27 |
| 2022 | 1.36 | 1.83 | 1.16 |
| 2021 | 2.67 | 5.35 | 1.14 |
| 2020 | 3.61 | 5.02 | 2.37 |
| 2019 | 3.41 | 4.4 | 2.66 |
| 2018 | 2.63 | 3.33 | 2.06 |
| 2017 | 5 | 8.47 | 2.84 |
| 2016 | 8.47 | 11.15 | 6.53 |
| 2015 | 11.36 | 19.42 | 7.24 |
| 2014 | 7.2 | 9.7 | 4.86 |
| 2013 | 4.82 | 6.38 | 3.55 |
| 2012 | 5.99 | 10.44 | 3.4 |
| 2011 | 10.05 | 13.18 | 7.26 |
| 2010 | 8.7 | 10.75 | 6.22 |
| 2009 | 6.14 | 7.9 | 3.62 |
| 2008 | 5.16 | 8.57 | 2.98 |
| 2007 | 5.04 | 7.39 | 2.09 |
| 2006 | 2.31 | 2.83 | 1.73 |
| 2005 | 2.64 | 3.45 | 1.96 |
| 2004 | 3.18 | 6.03 | 1.94 |