| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.23 | 1.57 | 1 |
| 2024 | 1.03 | 1.63 | 0.66 |
| 2023 | 0.69 | 1.8 | 0.45 |
| 2022 | 0.5 | 0.67 | 0.36 |
| 2021 | 0.87 | 1.27 | 0.56 |
| 2020 | 1.34 | 2.49 | 0.95 |
| 2019 | 1.66 | 2.5 | 1.25 |
| 2018 | 1.46 | 1.88 | 1.15 |
| 2017 | 1.96 | 3.02 | 1.47 |
| 2016 | 3.02 | 5.42 | 2.15 |
| 2015 | 5.43 | 9.48 | 3.58 |
| 2014 | 2.96 | 4.51 | 1.95 |
| 2013 | 2.37 | 3.12 | 1.74 |
| 2012 | 1.88 | 2.83 | 1.4 |
| 2011 | 2.12 | 2.7 | 1.51 |
| 2010 | 2.82 | 4.09 | 1.74 |
| 2009 | 2.59 | 3.85 | 1.13 |
| 2008 | 1.76 | 2.95 | 0.8 |
| 2007 | 2.08 | 3.08 | 0.88 |
| 2006 | 0.94 | 1.34 | 0.76 |
| 2005 | 0.73 | 0.91 | 0.33 |
| 2004 | 0.6 | 1.1 | 0.36 |