| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.02 | 3.16 | 2.77 |
| 2024 | 3.27 | 3.86 | 2.72 |
| 2023 | 4.57 | 5.14 | 3.56 |
| 2022 | 4.49 | 5.18 | 3.87 |
| 2021 | 5.01 | 5.96 | 4.37 |
| 2020 | 5.08 | 6.68 | 3.98 |
| 2019 | 5.25 | 6.44 | 4.39 |
| 2018 | 4.88 | 5.88 | 4.36 |
| 2017 | 5.85 | 6.61 | 5.39 |
| 2016 | 5.7 | 6.55 | 4.44 |
| 2015 | 5.33 | 10.52 | 3.21 |
| 2014 | 2.69 | 4.02 | 2.36 |
| 2013 | 2.77 | 3.44 | 2.31 |
| 2012 | 3.35 | 3.9 | 2.7 |
| 2011 | 4.68 | 5.6 | 3.45 |
| 2010 | 6.24 | 8.18 | 5.01 |
| 2009 | 7.49 | 9.32 | 5.56 |
| 2008 | 9.3 | 16.92 | 5.3 |
| 2007 | 13.8 | 18.95 | 8.51 |
| 2006 | 6.57 | 8.91 | 5.36 |
| 2005 | 6 | 7.71 | 4.04 |
| 2004 | 7.44 | 12.64 | 4.66 |