| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.14 | 1.31 | 0.94 |
| 2024 | 0.91 | 1.38 | 0.66 |
| 2023 | 1.42 | 1.84 | 1.16 |
| 2022 | 1.81 | 2.74 | 1.47 |
| 2021 | 1.75 | 2.55 | 1.33 |
| 2020 | 1.57 | 1.88 | 1.33 |
| 2019 | 1.71 | 2.57 | 1.35 |
| 2018 | 2.12 | 3.36 | 1.14 |
| 2017 | 4.5 | 6.17 | 3.14 |
| 2016 | 4.48 | 6.17 | 3.29 |
| 2015 | 4.72 | 7.74 | 3.08 |
| 2014 | 1.79 | 3.85 | 0.79 |
| 2013 | 1.52 | 2.73 | 0.84 |
| 2012 | 1.78 | 2.47 | 1.33 |
| 2011 | 1.78 | 2.31 | 1 |
| 2010 | 1.16 | 1.52 | 0.73 |
| 2009 | 0.65 | 1.18 | 0.26 |
| 2008 | 0.71 | 2.14 | 0.18 |
| 2007 | 10.58 | 27.41 | 1.47 |
| 2006 | 4.88 | 6.35 | 3.38 |
| 2005 | 4.72 | 6.01 | 2.15 |
| 2004 | 2.93 | 5.91 | 2.05 |