| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.93 | 5.39 | 2.74 |
| 2024 | 2.29 | 3.2 | 1.81 |
| 2023 | 2.25 | 2.85 | 1.8 |
| 2022 | 2.94 | 3.79 | 2.45 |
| 2021 | 3.68 | 4.72 | 3 |
| 2020 | 3.84 | 4.69 | 3.19 |
| 2019 | 3.27 | 3.83 | 2.72 |
| 2018 | 4.33 | 6.66 | 2.64 |
| 2017 | 8.3 | 10.93 | 6.18 |
| 2016 | 7.39 | 9.48 | 5.87 |
| 2015 | 7.64 | 15.9 | 3.89 |
| 2014 | 4.04 | 5 | 3.2 |
| 2013 | 2.74 | 4.57 | 1.75 |
| 2012 | 1.68 | 1.9 | 1.44 |
| 2011 | 2.2 | 2.87 | 1.47 |
| 2010 | 3.47 | 5.44 | 2.51 |
| 2009 | 2.52 | 4.82 | 1.04 |
| 2008 | 1.8 | 3.28 | 0.8 |
| 2007 | 2.09 | 3.28 | 0.93 |
| 2006 | 0.94 | 1.2 | 0.8 |
| 2005 | 1.03 | 1.31 | 0.76 |
| 2004 | 1.66 | 3.27 | 0.94 |