| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.03 | 3.97 | 2.22 |
| 2024 | 2.21 | 2.87 | 1.7 |
| 2023 | 1.84 | 2.63 | 1.52 |
| 2022 | 1.52 | 2.03 | 1.22 |
| 2021 | 1.74 | 2.04 | 1.45 |
| 2020 | 2.38 | 3.07 | 1.82 |
| 2019 | 2.89 | 4.96 | 2.11 |
| 2018 | 3.19 | 4.72 | 2.05 |
| 2017 | 4.04 | 6.45 | 2.7 |
| 2016 | 11.16 | 20.65 | 6.08 |
| 2015 | 18.82 | 26.03 | 10.48 |
| 2014 | 13.95 | 20.89 | 9.26 |
| 2013 | 7.69 | 13.27 | 3.03 |
| 2012 | 3.18 | 4.22 | 2.3 |
| 2011 | 3 | 3.83 | 2.52 |
| 2010 | 4.19 | 5.79 | 3.15 |