| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.88 | 4.5 | 3.36 |
| 2024 | 3.51 | 5.57 | 2.18 |
| 2023 | 5.45 | 7.21 | 3.83 |
| 2022 | 5.04 | 6.49 | 3.16 |
| 2021 | 4.78 | 7.64 | 2.39 |
| 2020 | 2.12 | 2.62 | 1.59 |
| 2019 | 2.59 | 3.56 | 1.7 |
| 2018 | 2.84 | 5.88 | 1.75 |
| 2017 | 3.35 | 4.84 | 2.45 |
| 2016 | 5.29 | 10.59 | 2.88 |
| 2015 | 7.98 | 12.65 | 4.06 |
| 2014 | 5.31 | 7.04 | 4.09 |
| 2013 | 4.15 | 6.28 | 2.84 |
| 2012 | 3.55 | 4.86 | 2.51 |
| 2011 | 5.54 | 7.37 | 2.86 |
| 2010 | 5.71 | 8.67 | 4.27 |
| 2009 | 3.9 | 6.16 | 2.14 |
| 2008 | 4.08 | 8.03 | 1.59 |
| 2007 | 5.18 | 7.29 | 2.77 |
| 2006 | 2.29 | 3.6 | 1.55 |
| 2005 | 1.45 | 1.97 | 1.02 |
| 2004 | 2.15 | 3.87 | 1.33 |