| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.35 | 5.91 | 3.46 |
| 2024 | 3.65 | 5.53 | 2.67 |
| 2023 | 5.43 | 7.29 | 4.03 |
| 2022 | 7.26 | 10.65 | 5.86 |
| 2021 | 2.91 | 11.64 | 1.71 |
| 2020 | 1.59 | 2.1 | 1.07 |
| 2019 | 2.29 | 3.79 | 1.67 |
| 2018 | 2 | 2.78 | 1.41 |
| 2017 | 3.5 | 5.48 | 2.65 |
| 2016 | 4.01 | 5.5 | 2.91 |
| 2015 | 3.16 | 5.57 | 0.74 |
| 2014 | 1.53 | 4.73 | 0.72 |
| 2013 | 4.68 | 6.59 | 3.16 |
| 2012 | 2.78 | 3.67 | 1.95 |
| 2011 | 3.51 | 4.44 | 1.98 |
| 2010 | 4.12 | 5.34 | 3 |
| 2009 | 3.43 | 5.02 | 1.47 |
| 2008 | 2.63 | 5.34 | 1.06 |
| 2007 | 3.19 | 5.19 | 1.43 |
| 2006 | 1.54 | 1.85 | 1.17 |
| 2005 | 1.1 | 1.53 | 0.72 |
| 2004 | 1.43 | 2.41 | 0.98 |