| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.87 | 5.33 | 4.38 |
| 2024 | 4.4 | 5.21 | 3.19 |
| 2023 | 5.13 | 5.92 | 4.56 |
| 2022 | 5.28 | 7.43 | 4.46 |
| 2021 | 3.84 | 5.27 | 2.92 |
| 2020 | 3.05 | 3.76 | 1.9 |
| 2019 | 3.41 | 4.83 | 2.71 |
| 2018 | 4.63 | 6.95 | 3.1 |
| 2017 | 4.77 | 6.23 | 3.29 |
| 2016 | 5.12 | 6.64 | 3.14 |
| 2015 | 4.95 | 7.8 | 2.56 |
| 2014 | 6.49 | 8.26 | 4.53 |
| 2013 | 5.39 | 6.81 | 4.15 |
| 2012 | 5.83 | 7.48 | 4.12 |
| 2011 | 6.79 | 8.43 | 5.64 |
| 2010 | 4.73 | 6.96 | 3.24 |
| 2009 | 2.81 | 4.11 | 2.03 |
| 2008 | 4.22 | 8.82 | 1.68 |
| 2007 | 5.88 | 9.5 | 2.13 |
| 2006 | 1.31 | 2.42 | 0.76 |
| 2005 | 0.84 | 0.98 | 0.64 |
| 2004 | 1.48 | 2.94 | 0.85 |