| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.43 | 1.7 | 1.2 |
| 2024 | 1.3 | 1.6 | 0.95 |
| 2023 | 1.28 | 1.58 | 1.11 |
| 2022 | 1.27 | 1.89 | 1.02 |
| 2021 | 1.72 | 2.08 | 1.48 |
| 2020 | 2.08 | 3.39 | 1.49 |
| 2019 | 1.46 | 1.81 | 1.18 |
| 2018 | 1.32 | 1.98 | 0.98 |
| 2017 | 2.1 | 2.59 | 1.73 |
| 2016 | 2.16 | 2.77 | 1.33 |
| 2015 | 2.73 | 2.97 | 2.13 |
| 2014 | 2.13 | 2.67 | 1.73 |
| 2013 | 3.56 | 7.22 | 1.94 |
| 2012 | 4.21 | 5.36 | 3.19 |
| 2011 | 8.7 | 15.13 | 4.01 |
| 2010 | 7.78 | 15.78 | 4.18 |
| 2009 | 3.04 | 5.15 | 1.56 |
| 2008 | 2.78 | 5.31 | 1.24 |