| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.9 | 5.64 | 4.32 |
| 2024 | 5.15 | 6.82 | 3.1 |
| 2023 | 4.93 | 7.04 | 3.89 |
| 2022 | 5.48 | 8.23 | 4.17 |
| 2021 | 3.39 | 8.38 | 0.89 |
| 2020 | 1.26 | 1.47 | 1.07 |
| 2019 | 1.41 | 1.81 | 1.21 |
| 2018 | 3.46 | 6.77 | 1.3 |
| 2017 | 14.53 | 36.72 | 6.06 |
| 2016 | 19.34 | 46.37 | 4.52 |
| 2015 | 7.62 | 14.41 | 4.01 |
| 2014 | 10.17 | 12.15 | 8.72 |
| 2013 | 9.65 | 11.19 | 7.87 |
| 2012 | 5.93 | 8.55 | 3.47 |
| 2011 | 6.55 | 9.34 | 3.55 |
| 2010 | 6.47 | 7.6 | 4.9 |
| 2009 | 3.89 | 7.3 | 1.4 |
| 2008 | 2.79 | 6.49 | 0.99 |
| 2007 | 3.16 | 5.8 | 0.8 |
| 2006 | 1.03 | 1.38 | 0.76 |
| 2005 | 0.86 | 1.3 | 0.34 |
| 2004 | 0.65 | 1.22 | 0.44 |