| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.44 | 0.48 | 0.41 |
| 2024 | 0.46 | 0.62 | 0.34 |
| 2023 | 0.68 | 0.86 | 0.55 |
| 2022 | 0.58 | 1.1 | 0.46 |
| 2021 | 0.83 | 1.27 | 0.46 |
| 2020 | 1.17 | 1.4 | 0.88 |
| 2019 | 1.29 | 1.98 | 0.9 |
| 2018 | 2 | 3.42 | 1.1 |
| 2017 | 3.87 | 5 | 3.05 |
| 2016 | 3.45 | 4.19 | 2.54 |
| 2015 | 4.09 | 7.77 | 1.61 |
| 2014 | 1.35 | 2.17 | 0.89 |
| 2013 | 1.26 | 2.12 | 1.02 |
| 2012 | 1.21 | 1.53 | 0.98 |
| 2011 | 1.22 | 1.51 | 0.88 |
| 2010 | 1.23 | 1.96 | 0.86 |
| 2009 | 1.43 | 2.01 | 0.61 |
| 2008 | 1.38 | 3.7 | 0.47 |
| 2007 | 2.38 | 3.94 | 1.22 |
| 2006 | 1.39 | 1.94 | 0.99 |
| 2005 | 1.05 | 1.3 | 0.85 |
| 2004 | 1.74 | 3.12 | 1.06 |