| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.82 | 4.19 | 3.4 |
| 2024 | 3.15 | 5.77 | 1.88 |
| 2023 | 3.17 | 4.4 | 2.36 |
| 2022 | 7.02 | 15.4 | 3.41 |
| 2021 | 6.74 | 17.5 | 1.25 |
| 2020 | 0.98 | 1.7 | 0.61 |
| 2019 | 0.66 | 0.81 | 0.46 |
| 2018 | 0.6 | 0.84 | 0.43 |
| 2017 | 0.66 | 0.85 | 0.57 |
| 2016 | 0.67 | 0.83 | 0.6 |
| 2015 | 0.9 | 1.36 | 0.63 |
| 2014 | 0.66 | 0.79 | 0.54 |
| 2013 | 0.67 | 0.86 | 0.52 |
| 2012 | 0.5 | 0.61 | 0.41 |
| 2011 | 0.82 | 1.2 | 0.45 |
| 2010 | 1.02 | 1.59 | 0.64 |
| 2009 | 0.98 | 1.44 | 0.39 |
| 2008 | 0.81 | 2.06 | 0.29 |
| 2007 | 2.04 | 2.72 | 0.86 |
| 2006 | 0.34 | 0.9 | 0.24 |
| 2005 | 1.87 | 4.75 | 0.27 |
| 2004 | 13.33 | 28.91 | 4.44 |