| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 3.04 | 3.54 | 2.71 |
| 2025 | 2.81 | 3.9 | 2.16 |
| 2024 | 1.55 | 3.99 | 0.9 |
| 2023 | 1.11 | 1.42 | 0.67 |
| 2022 | 1.37 | 1.99 | 0.94 |
| 2021 | 0.81 | 1.25 | 0.44 |
| 2020 | 1.04 | 1.41 | 0.71 |
| 2019 | 1.31 | 2.02 | 0.79 |
| 2018 | 2.17 | 3.57 | 1.47 |
| 2017 | 3.07 | 3.57 | 2.33 |
| 2016 | 2.06 | 3.3 | 0.98 |
| 2015 | 1.35 | 2.14 | 0.91 |
| 2014 | 1.02 | 1.21 | 0.92 |
| 2013 | 1.09 | 1.34 | 0.82 |
| 2012 | 1.07 | 1.54 | 0.67 |
| 2011 | 1.25 | 1.86 | 0.94 |
| 2010 | 1.3 | 1.53 | 1.07 |
| 2009 | 1.3 | 1.61 | 1.05 |
| 2008 | 1.13 | 2.13 | 0.59 |
| 2007 | 1.11 | 1.44 | 0.76 |
| 2006 | 0.74 | 1.05 | 0.45 |
| 2005 | 0.55 | 0.81 | 0.39 |
| 2004 | 2.22 | 4.43 | 0.8 |