| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.65 | 5.22 | 4.16 |
| 2024 | 4.34 | 5.96 | 3.18 |
| 2023 | 4.61 | 5.56 | 3.87 |
| 2022 | 4.14 | 4.99 | 3.2 |
| 2021 | 5.05 | 6.72 | 4.08 |
| 2020 | 7.28 | 10.4 | 5.02 |
| 2019 | 11.56 | 21.17 | 6.53 |
| 2018 | 3.38 | 6 | 1.92 |
| 2017 | 4.57 | 6.31 | 2.95 |
| 2016 | 3.31 | 4.5 | 2.45 |
| 2015 | 4.34 | 7.86 | 2.31 |
| 2014 | 3.6 | 4.84 | 1.85 |
| 2013 | 1.9 | 2.17 | 1.58 |
| 2012 | 2.09 | 2.64 | 1.51 |
| 2011 | 3.18 | 5.07 | 1.98 |
| 2010 | 2.33 | 3.09 | 1.49 |
| 2009 | 0.89 | 1.67 | 0.48 |
| 2008 | 0.53 | 0.8 | 0.3 |
| 2007 | 0.51 | 0.71 | 0.33 |
| 2006 | 0.32 | 0.49 | 0.13 |
| 2005 | 0.29 | 0.37 | 0.21 |
| 2004 | 0.39 | 0.56 | 0.25 |