| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.14 | 4.91 | 2.37 |
| 2024 | 2.56 | 3.68 | 2.24 |
| 2023 | 1.74 | 2.5 | 1.44 |
| 2022 | 1.41 | 2.06 | 1.1 |
| 2021 | 2.5 | 3.5 | 1.91 |
| 2020 | 2.19 | 3.27 | 1.3 |
| 2019 | 1.61 | 2.08 | 1.27 |
| 2018 | 2.76 | 4.06 | 1.35 |
| 2017 | 4.14 | 6.08 | 3.23 |
| 2016 | 6.87 | 12.69 | 5.01 |
| 2015 | 8.5 | 14.6 | 4.45 |
| 2014 | 5.14 | 6.02 | 4.49 |
| 2013 | 4.69 | 7.83 | 2.69 |
| 2012 | 2.38 | 2.92 | 1.94 |
| 2011 | 3.93 | 5.42 | 2.08 |
| 2010 | 3.69 | 4.18 | 2.92 |
| 2009 | 3.01 | 4.04 | 2.11 |
| 2008 | 2.31 | 3.86 | 1.37 |