| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.53 | 2.85 | 2.13 |
| 2024 | 1.7 | 3.39 | 1.06 |
| 2023 | 2.06 | 2.44 | 1.69 |
| 2022 | 1.98 | 2.36 | 1.68 |
| 2021 | 2.15 | 3.17 | 1.55 |
| 2020 | 1.19 | 2.5 | 0.49 |
| 2019 | 0.88 | 1.2 | 0.64 |
| 2018 | 2.53 | 4.65 | 0.99 |
| 2017 | 6.9 | 11.54 | 4.11 |
| 2016 | 10.42 | 14.53 | 6.43 |
| 2015 | 6.17 | 12.66 | 3.06 |
| 2014 | 3.16 | 4.14 | 2.38 |
| 2013 | 2.69 | 3.77 | 2.15 |
| 2012 | 2.36 | 3.03 | 1.72 |
| 2011 | 4.82 | 8.24 | 2.38 |
| 2010 | 7.69 | 12.11 | 5.23 |
| 2009 | 7.02 | 11.6 | 4.68 |