| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.78 | 5.2 | 4.19 |
| 2024 | 4.79 | 7.88 | 3.38 |
| 2023 | 4.56 | 6.74 | 3.41 |
| 2022 | 3.51 | 4.54 | 2.72 |
| 2021 | 3.5 | 5.18 | 3.03 |
| 2020 | 4.46 | 6.13 | 3.42 |
| 2019 | 4.94 | 5.97 | 4.15 |
| 2018 | 4.64 | 6.21 | 3.44 |
| 2017 | 8.43 | 13.39 | 4.56 |
| 2016 | 11.95 | 17.01 | 9.97 |
| 2015 | 8.4 | 19.13 | 3.04 |
| 2014 | 3.28 | 3.95 | 2.7 |
| 2013 | 2.67 | 3.14 | 2.27 |
| 2012 | 2.2 | 2.85 | 1.55 |
| 2011 | 2.95 | 4.24 | 1.62 |
| 2010 | 5.21 | 7.94 | 3.68 |
| 2009 | 6.27 | 9.37 | 3.52 |
| 2008 | 6.82 | 12.51 | 2.7 |
| 2007 | 10.69 | 21.06 | 6.43 |
| 2006 | 8.23 | 10.04 | 6.66 |
| 2005 | 4.07 | 7.2 | 2.07 |
| 2004 | 5.27 | 9.33 | 2.73 |