| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0.95 | 1.34 | 0.39 |
| 2022 | 1.57 | 2.02 | 1.27 |
| 2021 | 0.86 | 2.16 | 0.34 |
| 2020 | 0.44 | 0.73 | 0.3 |
| 2019 | 0.38 | 0.67 | 0.2 |
| 2018 | 0.47 | 0.58 | 0.24 |
| 2017 | 0.64 | 0.79 | 0.54 |
| 2016 | 0.94 | 1.21 | 0.66 |
| 2015 | 0.86 | 1.52 | 0.43 |
| 2014 | 0.38 | 0.52 | 0.27 |
| 2013 | 0.32 | 0.38 | 0.26 |
| 2012 | 0.35 | 0.43 | 0.29 |
| 2011 | 0.6 | 1 | 0.35 |
| 2010 | 0.69 | 0.96 | 0.52 |
| 2009 | 0.67 | 0.91 | 0.31 |
| 2008 | 0.86 | 2 | 0.25 |
| 2007 | 1.03 | 1.73 | 0.56 |
| 2006 | 0.51 | 0.75 | 0.34 |
| 2005 | 0.38 | 0.48 | 0.23 |
| 2004 | 0.46 | 0.6 | 0.32 |