| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.23 | 3.45 | 3.07 |
| 2024 | 4.01 | 5.48 | 2.77 |
| 2023 | 6.41 | 8 | 4.91 |
| 2022 | 5.88 | 7.39 | 4.41 |
| 2021 | 5.76 | 7.76 | 4.33 |
| 2020 | 3.95 | 7.24 | 2.53 |
| 2019 | 3.46 | 4.52 | 2.67 |
| 2018 | 4.46 | 7.28 | 2.58 |
| 2017 | 5.15 | 6.52 | 3.88 |
| 2016 | 3.7 | 4.73 | 2.65 |
| 2015 | 3.65 | 5.08 | 2.49 |
| 2014 | 2.71 | 3.73 | 2.21 |
| 2013 | 3.03 | 4.69 | 2.33 |
| 2012 | 4.25 | 5.52 | 3.08 |
| 2011 | 5.06 | 6.73 | 3.35 |
| 2010 | 7.52 | 9.04 | 6.07 |
| 2009 | 4.88 | 6.93 | 3.06 |
| 2008 | 5.54 | 11.56 | 2.31 |
| 2007 | 8.45 | 12.03 | 5.29 |
| 2006 | 4.5 | 6.38 | 3.33 |
| 2005 | 3.74 | 5.11 | 2.66 |
| 2004 | 4.56 | 8.61 | 2.78 |