| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.86 | 6.1 | 3.32 |
| 2024 | 3.43 | 5.12 | 2.71 |
| 2023 | 4.65 | 5.74 | 3.43 |
| 2022 | 3.56 | 4.23 | 3.24 |
| 2021 | 3.93 | 5.14 | 3.38 |
| 2020 | 4.54 | 5.93 | 3.19 |
| 2019 | 3.76 | 4.99 | 3.22 |
| 2018 | 4.78 | 7.52 | 2.95 |
| 2017 | 15.66 | 21.35 | 7.27 |
| 2016 | 14.98 | 22.41 | 9.39 |
| 2015 | 10.64 | 20.63 | 4.21 |
| 2014 | 3.31 | 5.16 | 1.96 |
| 2013 | 2.11 | 2.49 | 1.94 |
| 2012 | 2.71 | 3.82 | 1.63 |
| 2011 | 4.94 | 7.06 | 3.23 |
| 2010 | 7.35 | 10.33 | 4.61 |
| 2009 | 7.78 | 11.7 | 3.66 |
| 2008 | 11.35 | 42.91 | 2.46 |
| 2007 | 86.87 | 302.08 | 24.47 |
| 2006 | 17.84 | 26.46 | 10.07 |
| 2005 | 6.92 | 14.67 | 1.49 |
| 2004 | 4.1 | 7.38 | 1.76 |