| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.9 | 7.59 | 4.68 |
| 2024 | 4.71 | 7.02 | 3.3 |
| 2023 | 4.52 | 8.22 | 3.69 |
| 2022 | 3.87 | 5.37 | 2.75 |
| 2021 | 3.42 | 4.61 | 2.98 |
| 2020 | 4.29 | 5.47 | 3.29 |
| 2019 | 3.85 | 5.25 | 2.34 |
| 2018 | 2.92 | 4.86 | 2.13 |
| 2017 | 5.79 | 8.42 | 3.96 |
| 2016 | 9.37 | 11.6 | 7.46 |
| 2015 | 19.96 | 54.82 | 8.03 |
| 2014 | 6.17 | 9.67 | 4.64 |
| 2013 | 4.58 | 5.85 | 3.42 |
| 2012 | 3.58 | 4.7 | 2.86 |
| 2011 | 5.53 | 7.17 | 4.14 |
| 2010 | 6.28 | 7.96 | 4.66 |
| 2009 | 3.9 | 5.86 | 1.9 |
| 2008 | 3.21 | 5.71 | 1.38 |
| 2007 | 4.26 | 6.18 | 2.1 |
| 2006 | 2.27 | 2.85 | 1.91 |
| 2005 | 2.37 | 3.06 | 1.52 |
| 2004 | 3.15 | 4.52 | 2.01 |
| 2003 | 6 | 20.43 | 2.84 |