| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.9 | 2.14 | 1.76 |
| 2024 | 1.84 | 2.38 | 1.45 |
| 2023 | 2.26 | 2.91 | 1.83 |
| 2022 | 2.56 | 3.85 | 1.89 |
| 2021 | 1.93 | 3.24 | 1.65 |
| 2020 | 3.07 | 4.79 | 2.2 |
| 2019 | 2.35 | 2.85 | 2.11 |
| 2018 | 3.07 | 3.78 | 2.29 |
| 2017 | 3.89 | 4.6 | 3.45 |
| 2016 | 4.73 | 6.09 | 3.81 |
| 2015 | 6.28 | 9.75 | 4.68 |
| 2014 | 7.04 | 9.18 | 5.04 |
| 2013 | 8.77 | 11.36 | 6.67 |
| 2012 | 8.42 | 11.96 | 7.12 |
| 2011 | 9.84 | 14.2 | 6.67 |
| 2010 | 17.69 | 28.09 | 13.65 |