| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.68 | 6.27 | 4.92 |
| 2024 | 3.46 | 6.07 | 1.88 |
| 2023 | 4.49 | 7.81 | 2.77 |
| 2022 | 6.92 | 9.08 | 4.11 |
| 2021 | 4.32 | 10.19 | 2.26 |
| 2020 | 2.58 | 3.49 | 1.91 |
| 2019 | 2.36 | 3 | 1.88 |
| 2018 | 3.13 | 4.92 | 1.94 |
| 2017 | 5.21 | 5.97 | 4.37 |
| 2016 | 8.44 | 13.43 | 5.45 |
| 2015 | 7.59 | 14.21 | 4.42 |
| 2014 | 4.03 | 4.73 | 2.97 |
| 2013 | 5 | 6.81 | 3.57 |
| 2012 | 2.98 | 3.97 | 1.89 |
| 2011 | 6.51 | 9.73 | 2.56 |
| 2010 | 3.49 | 8.84 | 1.9 |
| 2009 | 3.1 | 4.61 | 1.28 |
| 2008 | 2.8 | 4.86 | 0.95 |
| 2007 | 2.48 | 4.31 | 1.18 |
| 2006 | 1.33 | 1.61 | 1.17 |
| 2005 | 1.76 | 2.36 | 1.18 |