| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.71 | 3.03 | 2.55 |
| 2024 | 3.44 | 4.81 | 2.69 |
| 2023 | 5.29 | 7.04 | 4.45 |
| 2022 | 4.88 | 8.96 | 3.26 |
| 2021 | 4.54 | 8.14 | 2.94 |
| 2020 | 2.66 | 3.87 | 1.87 |
| 2019 | 2.22 | 2.77 | 1.9 |
| 2018 | 2.83 | 3.84 | 1.94 |
| 2017 | 4.15 | 5.21 | 3.31 |
| 2016 | 4.38 | 5.54 | 3.53 |
| 2015 | 5.04 | 7.58 | 3.38 |
| 2014 | 4.14 | 5.31 | 3.1 |
| 2013 | 3.46 | 4.2 | 2.67 |
| 2012 | 2.94 | 3.79 | 2.35 |
| 2011 | 3.53 | 5.01 | 2.57 |
| 2010 | 3.38 | 4.93 | 2.4 |
| 2009 | 1.91 | 3.18 | 1.03 |
| 2008 | 1.4 | 2.32 | 0.81 |
| 2007 | 2.08 | 3.19 | 1.35 |
| 2006 | 1.27 | 1.6 | 0.77 |
| 2005 | 1 | 1.25 | 0.85 |