| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.94 | 2.17 | 1.72 |
| 2024 | 2.1 | 2.99 | 1.48 |
| 2023 | 2.65 | 4.2 | 1.8 |
| 2022 | 1.99 | 2.5 | 1.53 |
| 2021 | 2.42 | 2.94 | 1.99 |
| 2020 | 2.79 | 4.14 | 1.79 |
| 2019 | 2.35 | 3.6 | 1.61 |
| 2018 | 2.08 | 2.82 | 1.49 |
| 2017 | 2.96 | 4.53 | 1.99 |
| 2016 | 4.42 | 5.62 | 3.06 |
| 2015 | 4.08 | 7.37 | 1.98 |
| 2014 | 1.54 | 2.82 | 1.16 |
| 2013 | 1.16 | 1.44 | 0.99 |
| 2012 | 1.02 | 1.29 | 0.87 |
| 2011 | 1.59 | 2.52 | 0.88 |
| 2010 | 2.07 | 3.01 | 1.6 |
| 2009 | 1.06 | 2.06 | 0.44 |
| 2008 | 0.88 | 1.78 | 0.36 |
| 2007 | 1.35 | 2.17 | 0.86 |
| 2006 | 0.58 | 0.91 | 0.36 |
| 2005 | 0.43 | 0.54 | 0.34 |
| 2004 | 0.88 | 2.29 | 0.49 |