| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.81 | 4.62 | 3.4 |
| 2024 | 4.88 | 6.63 | 3.26 |
| 2023 | 4.07 | 4.87 | 3.21 |
| 2022 | 3.32 | 4.43 | 2.5 |
| 2021 | 3.39 | 4.21 | 2.8 |
| 2020 | 5.29 | 6.73 | 3.1 |
| 2019 | 5.06 | 6.6 | 3.59 |
| 2018 | 10.02 | 20.59 | 3.71 |
| 2017 | 18.24 | 24.22 | 11.6 |
| 2016 | 19.89 | 24.14 | 10.49 |
| 2015 | 23.05 | 39.97 | 12.11 |
| 2014 | 17.15 | 27.03 | 12.05 |
| 2013 | 46.82 | 75.84 | 23.59 |
| 2012 | 19.45 | 27.61 | 11.3 |
| 2011 | 21.31 | 29.76 | 12.42 |
| 2010 | 17.26 | 22.33 | 12.71 |
| 2009 | 26.47 | 42.56 | 18.11 |
| 2008 | 51.49 | 92.21 | 17.48 |
| 2007 | 40.48 | 72.51 | 8.68 |
| 2006 | 6.23 | 9.1 | 4.07 |
| 2005 | 4.68 | 6.29 | 3.62 |
| 2004 | 6.54 | 12.29 | 4.31 |