| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.46 | 6.78 | 4.72 |
| 2024 | 3.89 | 6.35 | 3.06 |
| 2023 | 6.11 | 8.75 | 4.82 |
| 2022 | 9.17 | 15.16 | 6.34 |
| 2021 | 9.05 | 15.45 | 3.63 |
| 2020 | 2.99 | 4.75 | 1.93 |
| 2019 | 3.39 | 6.38 | 2.09 |
| 2018 | 4.11 | 5.45 | 2.83 |
| 2017 | 5.01 | 6.99 | 2.82 |
| 2016 | 3.02 | 3.7 | 2.37 |
| 2015 | 2.92 | 4.96 | 1.91 |
| 2014 | 1.7 | 2.14 | 1.4 |
| 2013 | 1.53 | 2.02 | 1.17 |
| 2012 | 1.33 | 1.81 | 1.05 |
| 2011 | 2.36 | 3.25 | 1.31 |
| 2010 | 3.33 | 4.15 | 2.63 |
| 2009 | 2.8 | 3.71 | 1.4 |
| 2008 | 2.63 | 5.72 | 1.1 |
| 2007 | 4.85 | 7.85 | 2.04 |
| 2006 | 1.77 | 2.4 | 1.19 |
| 2005 | 1.21 | 1.58 | 0.78 |
| 2004 | 1.2 | 2.12 | 0.77 |