| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.47 | 1.77 | 1.34 |
| 2024 | 1.48 | 2 | 1.25 |
| 2023 | 2.33 | 3.18 | 1.76 |
| 2022 | 2.38 | 3.36 | 1.78 |
| 2021 | 1.97 | 2.7 | 1.61 |
| 2020 | 2.15 | 2.44 | 1.86 |
| 2019 | 2.78 | 3.25 | 2.23 |
| 2018 | 2.97 | 3.65 | 2.3 |
| 2017 | 4.34 | 6.19 | 3.36 |
| 2016 | 5.01 | 5.7 | 4.25 |
| 2015 | 8.26 | 16.89 | 4.53 |
| 2014 | 5.26 | 6.77 | 4.4 |
| 2013 | 3.85 | 4.93 | 3.3 |
| 2012 | 3.22 | 3.61 | 2.96 |
| 2011 | 4.85 | 6.59 | 3.1 |
| 2010 | 5.73 | 7.05 | 4.58 |
| 2009 | 4.95 | 6.61 | 3.25 |
| 2008 | 4.66 | 8.23 | 2.79 |