| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.29 | 2.72 | 1.85 |
| 2024 | 1.69 | 2.89 | 1.17 |
| 2023 | 1.85 | 2.14 | 1.59 |
| 2022 | 1.66 | 2.07 | 1.32 |
| 2021 | 1.64 | 2.35 | 1.32 |
| 2020 | 1.47 | 1.8 | 1.21 |
| 2019 | 1.66 | 2.17 | 1.21 |
| 2018 | 2.1 | 3.37 | 1.19 |
| 2017 | 4.76 | 8.58 | 3.11 |
| 2016 | 8.26 | 11.73 | 4.75 |
| 2015 | 5.79 | 8.86 | 3.08 |
| 2014 | 7.6 | 14.37 | 2.52 |
| 2013 | 10.61 | 14.74 | 7.14 |
| 2012 | 8.64 | 14.68 | 4.02 |
| 2011 | 6.27 | 8.6 | 4.23 |
| 2010 | 8.04 | 11.75 | 5.95 |
| 2009 | 5.11 | 7.69 | 2.51 |
| 2008 | 3.26 | 7.08 | 1.16 |