| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.51 | 4.13 | 3.25 |
| 2024 | 3.8 | 5.29 | 3.01 |
| 2023 | 2.18 | 3.8 | 1.9 |
| 2022 | 2.33 | 3.66 | 1.79 |
| 2021 | 2.75 | 4.72 | 1.7 |
| 2020 | 1.97 | 2.62 | 1.5 |
| 2019 | 2.37 | 3.34 | 1.52 |
| 2018 | 2.94 | 4.51 | 1.55 |
| 2017 | 9.61 | 19.8 | 3.79 |
| 2016 | 15.05 | 20.72 | 12.22 |
| 2015 | 13.36 | 21.53 | 8.26 |
| 2014 | 9.31 | 12.16 | 5.76 |
| 2013 | 3.56 | 6.25 | 2.49 |
| 2012 | 5.18 | 7.25 | 3.2 |
| 2011 | 8.74 | 14.71 | 5.56 |
| 2010 | 31.67 | 74.4 | 11.72 |
| 2009 | 54.07 | 64.38 | 39.92 |
| 2008 | 447.8 | 850.97 | 36.78 |
| 2007 | 7.03 | 37.88 | 2.49 |
| 2006 | 2.4 | 3.68 | 1.57 |
| 2005 | 2.01 | 2.68 | 1.43 |
| 2004 | 6.07 | 13.84 | 2.12 |