| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.47 | 5.12 | 2.96 |
| 2024 | 2.59 | 5.44 | 1.58 |
| 2023 | 2.52 | 3.23 | 2.12 |
| 2022 | 2.69 | 3.97 | 2.12 |
| 2021 | 3.33 | 3.89 | 2.65 |
| 2020 | 3.65 | 4.23 | 3.27 |
| 2019 | 4.05 | 7.19 | 3.15 |
| 2018 | 4.98 | 6.74 | 3.25 |
| 2017 | 8.1 | 11.3 | 6.27 |
| 2016 | 3.96 | 8.29 | 2.38 |
| 2015 | 2.88 | 3.15 | 2.34 |
| 2014 | 1.51 | 2.84 | 0.98 |
| 2013 | 2.44 | 4.2 | 1.43 |
| 2012 | 1.05 | 1.66 | 0.72 |
| 2011 | 0.97 | 1.21 | 0.79 |
| 2010 | 1.59 | 2.94 | 0.94 |
| 2009 | 2.07 | 3.27 | 0.73 |
| 2008 | 1.75 | 3.83 | 0.56 |
| 2007 | 1.82 | 3.38 | 0.68 |
| 2006 | 0.6 | 0.73 | 0.5 |
| 2005 | 0.74 | 1.02 | 0.61 |
| 2004 | 1.26 | 2.44 | 0.68 |