| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.13 | 1.25 | 1 |
| 2024 | 1.12 | 1.37 | 0.97 |
| 2023 | 2.37 | 4.55 | 1.16 |
| 2022 | 5.67 | 9.61 | 3.47 |
| 2021 | 10.02 | 14.64 | 5.47 |
| 2020 | 7.05 | 12.97 | 2.7 |
| 2019 | 2.76 | 4.17 | 2.14 |
| 2018 | 3.62 | 5.18 | 2.37 |
| 2017 | 5.72 | 6.73 | 4.74 |
| 2016 | 9.65 | 18 | 5.75 |
| 2015 | 16.89 | 37.9 | 4.74 |
| 2014 | 3.38 | 6.35 | 2.08 |
| 2013 | 2.36 | 3.26 | 1.79 |
| 2012 | 2.67 | 3.89 | 2.01 |
| 2011 | 5.06 | 7.37 | 3.25 |
| 2010 | 4.63 | 6.45 | 3.32 |
| 2009 | 3.75 | 4.81 | 2.87 |
| 2008 | 3.57 | 6.51 | 1.35 |
| 2007 | 4.81 | 5.83 | 3.86 |