| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.74 | 2.52 | 1.38 |
| 2024 | 1.81 | 2.77 | 1.34 |
| 2023 | 4.14 | 9.51 | 1.99 |
| 2022 | 5.72 | 7.98 | 2.32 |
| 2021 | 2.7 | 3.43 | 2.03 |
| 2020 | 1.96 | 3.59 | 1.19 |
| 2019 | 1.83 | 3.42 | 1.2 |
| 2018 | 2.35 | 3.04 | 1.76 |
| 2017 | 3.9 | 5.35 | 2.7 |
| 2016 | 4.45 | 5.86 | 3.29 |
| 2015 | 5.34 | 8.33 | 2.74 |
| 2014 | 5.14 | 6.59 | 3.73 |
| 2013 | 6.1 | 7.43 | 4.93 |
| 2012 | 6.28 | 8.59 | 4.83 |
| 2011 | 9.75 | 13.39 | 6.86 |
| 2010 | 9.7 | 20.35 | 5.02 |
| 2009 | 8.51 | 10.04 | 7.18 |
| 2008 | 10.7 | 17.23 | 6.4 |