| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.34 | 3.53 | 3.11 |
| 2024 | 3.42 | 4.31 | 2.71 |
| 2023 | 3.21 | 5.28 | 2.68 |
| 2022 | 2.98 | 3.61 | 2.41 |
| 2021 | 2.86 | 3.8 | 2.55 |
| 2020 | 3.02 | 3.61 | 2.45 |
| 2019 | 3.73 | 4.77 | 2.86 |
| 2018 | 4.05 | 4.6 | 3.36 |
| 2017 | 5.87 | 7.45 | 4.26 |
| 2016 | 4.11 | 5.75 | 2.48 |
| 2015 | 3.92 | 5.45 | 2.07 |
| 2014 | 1.86 | 2.28 | 1.62 |
| 2013 | 1.98 | 2.36 | 1.69 |
| 2012 | 2.49 | 3.29 | 1.65 |
| 2011 | 3.68 | 5.58 | 2.82 |
| 2010 | 4.92 | 6.06 | 3.95 |
| 2009 | 2.97 | 4.21 | 2.38 |
| 2008 | 2.91 | 4.9 | 1.46 |
| 2007 | 3.72 | 5.08 | 1.78 |
| 2006 | 1.26 | 1.82 | 0.91 |
| 2005 | 0.78 | 1 | 0.53 |
| 2004 | 1.02 | 1.68 | 0.62 |