| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.81 | 5.22 | 4.37 |
| 2024 | 4.32 | 6.01 | 3.51 |
| 2023 | 4.11 | 5.7 | 3.23 |
| 2022 | 3.59 | 4.54 | 2.86 |
| 2021 | 4.47 | 6.08 | 3.93 |
| 2020 | 4.85 | 6.22 | 4.02 |
| 2019 | 4.97 | 7.16 | 3.18 |
| 2018 | 4.26 | 6.94 | 2.36 |
| 2017 | 7.68 | 11.3 | 5.61 |
| 2016 | 9.37 | 21.87 | 4.63 |
| 2015 | 6.73 | 11.66 | 4.15 |
| 2014 | 4.36 | 6.96 | 3.78 |
| 2013 | 4.96 | 6.63 | 3.25 |
| 2012 | 3.58 | 4.41 | 2.87 |
| 2011 | 5.55 | 7.12 | 3.68 |
| 2010 | 6.79 | 9.63 | 5.28 |
| 2009 | 7.74 | 9.61 | 5.5 |
| 2008 | 9.65 | 20.38 | 3.71 |
| 2007 | 14.54 | 23.97 | 4.14 |
| 2006 | 3.07 | 4.41 | 2.46 |
| 2005 | 2.38 | 3.77 | 1.41 |
| 2004 | 2.24 | 2.89 | 1.61 |