| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 2.06 | 2.24 | 1.75 |
| 2025 | 2.13 | 2.53 | 1.77 |
| 2024 | 2.56 | 5.34 | 1.64 |
| 2023 | 1.54 | 5.57 | 0.75 |
| 2022 | 0.83 | 1.11 | 0.65 |
| 2021 | 0.68 | 0.91 | 0.54 |
| 2020 | 0.78 | 1.01 | 0.64 |
| 2019 | 0.75 | 1 | 0.6 |
| 2018 | 0.8 | 1.12 | 0.59 |
| 2017 | 1.27 | 1.71 | 0.99 |
| 2016 | 1.84 | 3.28 | 1.52 |
| 2015 | 1.94 | 3.18 | 0.86 |
| 2014 | 1.04 | 1.37 | 0.82 |
| 2013 | 0.6 | 0.94 | 0.45 |
| 2012 | 0.49 | 0.6 | 0.39 |
| 2011 | 0.83 | 1.21 | 0.46 |
| 2010 | 1.21 | 1.52 | 0.92 |
| 2009 | 1.15 | 1.63 | 0.78 |
| 2008 | 1.08 | 1.99 | 0.42 |
| 2007 | 0.81 | 1.25 | 0.41 |
| 2006 | 0.4 | 0.49 | 0.27 |
| 2005 | 0.3 | 0.39 | 0.19 |
| 2004 | 0.45 | 0.68 | 0.29 |