| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.84 | 1.14 | 0.66 |
| 2024 | 1.19 | 2.16 | 0.69 |
| 2023 | 0.97 | 1.12 | 0.72 |
| 2022 | 4.04 | 14.35 | 0.64 |
| 2021 | 3.73 | 12.22 | 2 |
| 2020 | 1.51 | 2.45 | 1.12 |
| 2019 | 1.17 | 1.52 | 0.82 |
| 2018 | 0.96 | 1.33 | 0.68 |
| 2017 | 1.68 | 2.36 | 1.26 |
| 2016 | 1.52 | 1.98 | 1.12 |
| 2015 | 1.59 | 2.67 | 0.99 |
| 2014 | 0.9 | 1.1 | 0.73 |
| 2013 | 1.2 | 1.5 | 0.96 |
| 2012 | 0.92 | 1.3 | 0.6 |
| 2011 | 1.2 | 2.1 | 0.64 |
| 2010 | 1.32 | 2.12 | 0.94 |
| 2009 | 1.09 | 1.37 | 0.72 |
| 2008 | 1.35 | 2.42 | 0.53 |
| 2007 | 1.42 | 2.46 | 0.52 |
| 2006 | 0.53 | 0.61 | 0.43 |
| 2005 | 0.42 | 0.59 | 0.29 |
| 2004 | 0.49 | 0.92 | 0.3 |