| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.27 | 1.54 | 1.11 |
| 2024 | 1.24 | 1.76 | 0.99 |
| 2023 | 2 | 3.54 | 1.1 |
| 2022 | 2.72 | 5.65 | 1.48 |
| 2021 | 1.97 | 2.97 | 1.58 |
| 2020 | 1.7 | 3.04 | 1.51 |
| 2019 | 1.91 | 2.41 | 1.66 |
| 2018 | 2.04 | 2.68 | 1.59 |
| 2017 | 3.42 | 4.32 | 2.52 |
| 2016 | 3.52 | 5.06 | 2 |
| 2015 | 2.72 | 4.81 | 1.7 |
| 2014 | 1.3 | 1.82 | 1.1 |
| 2013 | 1.33 | 1.73 | 1.02 |
| 2012 | 0.97 | 1.18 | 0.77 |
| 2011 | 1.86 | 2.61 | 0.99 |
| 2010 | 2.02 | 2.57 | 1.34 |
| 2009 | 1.85 | 2.89 | 1.13 |
| 2008 | 4.49 | 9.12 | 0.76 |
| 2007 | 6.09 | 10.08 | 2.65 |
| 2006 | 2.47 | 3.11 | 1.88 |
| 2005 | 2.25 | 2.68 | 1.66 |
| 2004 | 3.51 | 6.39 | 2.2 |