| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.66 | 3.64 | 2.35 |
| 2024 | 2.53 | 3.9 | 1.86 |
| 2023 | 4.01 | 4.47 | 3.4 |
| 2022 | 4.08 | 5.04 | 3.5 |
| 2021 | 3.64 | 4.64 | 3.01 |
| 2020 | 2.49 | 3.82 | 1.66 |
| 2019 | 1.92 | 2.39 | 1.51 |
| 2018 | 1.85 | 2.51 | 1.34 |
| 2017 | 3.12 | 4.76 | 2.05 |
| 2016 | 2.88 | 3.41 | 2.29 |
| 2015 | 3.85 | 7.5 | 2.3 |
| 2014 | 2.2 | 3.06 | 1.7 |
| 2013 | 2.02 | 2.38 | 1.68 |
| 2012 | 2.01 | 2.47 | 1.61 |
| 2011 | 3.38 | 4.79 | 1.98 |
| 2010 | 4.92 | 7.11 | 3.65 |
| 2009 | 6.06 | 8.01 | 4.28 |
| 2008 | 12.91 | 32 | 3.71 |
| 2007 | 15.77 | 26.02 | 5.4 |
| 2006 | 2.88 | 5.27 | 1.15 |
| 2005 | 1.41 | 2.41 | 1.06 |