| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.54 | 8.26 | 4.56 |
| 2024 | 2.9 | 8.26 | 1.65 |
| 2023 | 2.71 | 3.71 | 2.17 |
| 2022 | 4.59 | 6.7 | 2.64 |
| 2021 | 3.52 | 7.26 | 1.39 |
| 2020 | 1.7 | 2.28 | 1.18 |
| 2019 | 1.53 | 2.06 | 1.26 |
| 2018 | 2.65 | 5.51 | 1.14 |
| 2017 | 5.55 | 6.67 | 4.61 |
| 2016 | 7.27 | 10.45 | 5.75 |
| 2015 | 6.87 | 12.43 | 2.55 |
| 2014 | 2.34 | 2.9 | 2 |
| 2013 | 2.75 | 3.69 | 2.24 |
| 2012 | 3.68 | 5.03 | 2.69 |
| 2011 | 5.17 | 7.28 | 3.1 |
| 2010 | 4.01 | 5.98 | 2.87 |
| 2009 | 2.85 | 3.8 | 1.78 |
| 2008 | 2.44 | 3.79 | 1.27 |
| 2007 | 3.12 | 4.32 | 2.02 |
| 2006 | 1.97 | 2.49 | 1.59 |
| 2005 | 1.89 | 2.33 | 1.42 |
| 2004 | 2.8 | 5.15 | 1.77 |