| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.24 | 6.05 | 4.84 |
| 2024 | 3.57 | 6.87 | 1.34 |
| 2023 | 1.36 | 1.77 | 1.05 |
| 2022 | 1.14 | 1.53 | 0.98 |
| 2021 | 3.19 | 7.93 | 1.04 |
| 2020 | 5.16 | 8.26 | 3.35 |
| 2019 | 3.12 | 3.95 | 1.97 |
| 2018 | 3.79 | 6.51 | 1.94 |
| 2017 | 4.4 | 6.32 | 2.97 |
| 2016 | 6.11 | 14.63 | 4.24 |
| 2015 | 7.46 | 16.43 | 4.38 |
| 2014 | 5.51 | 6.28 | 4.84 |
| 2013 | 3.89 | 7.07 | 2.68 |
| 2012 | 3.37 | 4.64 | 2.39 |
| 2011 | 5.06 | 6.4 | 3.76 |
| 2010 | 6.33 | 10.53 | 3.89 |
| 2009 | 8.72 | 11.11 | 6.14 |
| 2008 | 16.78 | 32.36 | 5.59 |
| 2007 | 20.83 | 32.29 | 9.51 |
| 2006 | 9.84 | 11.7 | 7.78 |
| 2005 | 8.89 | 10.83 | 5.36 |
| 2004 | 10.1 | 16.26 | 6.72 |