| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.57 | 1.96 | 0.98 |
| 2024 | 0.74 | 1.45 | 0.48 |
| 2023 | 0.62 | 0.91 | 0.43 |
| 2022 | 0.51 | 0.9 | 0.38 |
| 2021 | 0.53 | 0.85 | 0.42 |
| 2020 | 0.39 | 0.51 | 0.26 |
| 2019 | 0.41 | 0.63 | 0.31 |
| 2018 | 0.82 | 1.3 | 0.41 |
| 2017 | 1.74 | 2.38 | 1.19 |
| 2016 | 5.55 | 11.51 | 2.15 |
| 2015 | 7.92 | 15.98 | 2.13 |
| 2014 | 1.9 | 2.46 | 1.34 |
| 2013 | 1.26 | 1.56 | 1.02 |
| 2012 | 1.39 | 1.86 | 1.03 |
| 2011 | 2.44 | 3.56 | 1.27 |
| 2010 | 3.67 | 5.21 | 2.5 |
| 2009 | 4.31 | 5.59 | 2.23 |
| 2008 | 3.68 | 9.14 | 1.04 |
| 2007 | 4.35 | 8.8 | 1.1 |
| 2006 | 1.13 | 1.34 | 0.9 |
| 2005 | 1.21 | 1.46 | 0.99 |