| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.22 | 8.16 | 6.47 |
| 2024 | 4.81 | 10.72 | 2.52 |
| 2023 | 4.1 | 5.1 | 3.35 |
| 2022 | 2.64 | 4.5 | 1.45 |
| 2021 | 3.94 | 8.37 | 2.51 |
| 2020 | 7.85 | 10.77 | 6 |
| 2019 | 5.44 | 9.01 | 2.25 |
| 2018 | 2.32 | 3.41 | 1.11 |
| 2017 | 2.2 | 3.01 | 1.6 |
| 2016 | 3.43 | 5.08 | 2.79 |
| 2015 | 6.21 | 9.86 | 3.07 |
| 2014 | 3.69 | 5.25 | 2.05 |
| 2013 | 1.77 | 3.7 | 0.85 |
| 2012 | 1.36 | 1.78 | 0.84 |
| 2011 | 1.51 | 2.01 | 1.24 |
| 2010 | 2.01 | 2.73 | 1.48 |
| 2009 | 1.96 | 3.03 | 0.59 |
| 2008 | 1 | 1.9 | 0.38 |
| 2007 | 1.88 | 2.73 | 1.47 |
| 2006 | 1.47 | 1.72 | 1.23 |
| 2005 | 1.58 | 2.05 | 1.04 |
| 2004 | 2.58 | 4.99 | 1.38 |