| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.66 | 5.75 | 1.54 |
| 2024 | 1.54 | 2.06 | 1.23 |
| 2023 | 2.72 | 4.95 | 1.61 |
| 2022 | 4.03 | 4.46 | 3.43 |
| 2021 | 4.09 | 4.75 | 3.32 |
| 2020 | 8.54 | 13.38 | 4.46 |
| 2019 | 10.81 | 13.86 | 8.09 |
| 2018 | 11.14 | 20.23 | 5.06 |
| 2017 | 7.47 | 12.25 | 5.41 |
| 2016 | 9.97 | 12.33 | 7.39 |
| 2015 | 7.88 | 12.52 | 3.6 |
| 2014 | 4.2 | 6.57 | 2.74 |
| 2013 | 5.74 | 8.06 | 4.25 |
| 2012 | 4.25 | 5.94 | 3.45 |
| 2011 | 6.34 | 8.33 | 3.73 |
| 2010 | 9.23 | 15.01 | 7.1 |
| 2009 | 5.35 | 7.86 | 3.52 |
| 2008 | 5.64 | 9.66 | 3.11 |
| 2007 | 8.06 | 12.99 | 3.35 |
| 2006 | 3.61 | 4.68 | 2.78 |
| 2005 | 2.58 | 3.2 | 2.05 |
| 2004 | 3.81 | 7.05 | 2.27 |