| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.08 | 2.59 | 1.7 |
| 2024 | 1.86 | 2.33 | 1.36 |
| 2023 | 3.2 | 5.62 | 1.96 |
| 2022 | 4.17 | 6.22 | 2.5 |
| 2021 | 3.28 | 4.97 | 2.28 |
| 2020 | 3.4 | 4.62 | 2.83 |
| 2019 | 4.27 | 6.7 | 3.07 |
| 2018 | 4.84 | 7.04 | 3.35 |
| 2017 | 7.52 | 8.65 | 6.38 |
| 2016 | 12.46 | 21.69 | 7.46 |
| 2015 | 17.56 | 27.77 | 10.35 |
| 2014 | 8.8 | 14.26 | 5.37 |
| 2013 | 5.03 | 6.71 | 3.45 |
| 2012 | 3.08 | 4.07 | 2.24 |
| 2011 | 4.7 | 6.44 | 1.87 |
| 2010 | 3.41 | 4.72 | 2.35 |
| 2009 | 2.7 | 3.45 | 1.17 |
| 2008 | 2.27 | 5.1 | 0.75 |
| 2007 | 3.01 | 4.58 | 1.54 |
| 2006 | 1.58 | 2.03 | 1.11 |
| 2005 | 1.26 | 2.19 | 0.85 |
| 2004 | 2.36 | 4.56 | 1.39 |