| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.88 | 3.84 | 2.14 |
| 2024 | 2.31 | 3.04 | 1.72 |
| 2023 | 3.49 | 4.07 | 2.89 |
| 2022 | 2.85 | 4.13 | 2.17 |
| 2021 | 5.72 | 10.81 | 3.67 |
| 2020 | 8.11 | 10.84 | 6.01 |
| 2019 | 7.75 | 9.72 | 5.72 |
| 2018 | 11.67 | 20.35 | 6.45 |
| 2017 | 12.16 | 16.9 | 9.34 |
| 2016 | 11.83 | 13 | 9.67 |
| 2015 | 31.99 | 98.72 | 5.81 |
| 2014 | 4.65 | 6.63 | 3.4 |
| 2013 | 3.88 | 4.65 | 2.96 |
| 2012 | 5.18 | 6.57 | 3.27 |
| 2011 | 8.1 | 9.63 | 5.97 |
| 2010 | 5.06 | 8.28 | 3.56 |
| 2009 | 3.29 | 4.73 | 1.95 |
| 2008 | 3.06 | 5.48 | 1.35 |
| 2007 | 3.35 | 4.45 | 1.95 |
| 2006 | 2.05 | 2.42 | 1.76 |