| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.72 | 2.94 | 2.35 |
| 2024 | 2.55 | 3.51 | 1.81 |
| 2023 | 3.67 | 5.28 | 2.44 |
| 2022 | 5.11 | 6.54 | 3.52 |
| 2021 | 3.67 | 6.67 | 2.16 |
| 2020 | 1.88 | 3.46 | 1.3 |
| 2019 | 1.35 | 1.71 | 1.08 |
| 2018 | 1.28 | 1.78 | 0.95 |
| 2017 | 2.08 | 2.8 | 1.68 |
| 2016 | 2.06 | 2.37 | 1.78 |
| 2015 | 3.16 | 5.41 | 1.86 |
| 2014 | 1.97 | 3.25 | 1.27 |
| 2013 | 1.97 | 2.61 | 1.16 |
| 2012 | 1.25 | 1.71 | 0.92 |
| 2011 | 2.5 | 3.84 | 1.15 |
| 2010 | 4.16 | 7.34 | 2.43 |
| 2009 | 4.38 | 6.94 | 1.58 |
| 2008 | 6.98 | 38.04 | 1.05 |
| 2007 | 20.25 | 35.38 | 7.55 |
| 2006 | 6.48 | 11.28 | 4.21 |
| 2005 | 4.08 | 5.23 | 2.98 |
| 2004 | 5.2 | 10.31 | 3.1 |