| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.44 | 1.82 | 0.91 |
| 2024 | 1.03 | 1.4 | 0.75 |
| 2023 | 1.11 | 1.5 | 0.76 |
| 2022 | 1.2 | 1.54 | 0.71 |
| 2021 | 1.06 | 1.72 | 0.75 |
| 2020 | 0.77 | 1.03 | 0.57 |
| 2019 | 0.72 | 0.87 | 0.59 |
| 2018 | 0.93 | 1.32 | 0.61 |
| 2017 | 1.5 | 1.81 | 1.21 |
| 2016 | 1.66 | 2.16 | 1.08 |
| 2015 | 1.26 | 2.24 | 0.61 |
| 2014 | 1.33 | 4.27 | 0.53 |
| 2013 | 2.11 | 3.91 | 1.41 |
| 2012 | 0 | ||
| 2011 | 0 | ||
| 2010 | 2.34 | 2.76 | 1.95 |
| 2009 | 1.75 | 2.74 | 0.58 |
| 2008 | 1.31 | 3.44 | 0.42 |
| 2007 | 3.01 | 5 | 1.57 |
| 2006 | 1.62 | 2.62 | 0.69 |
| 2005 | 0.62 | 0.8 | 0.33 |
| 2004 | 0.63 | 1.22 | 0.39 |