| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.87 | 4.78 | 3.33 |
| 2024 | 3.24 | 5.06 | 2.27 |
| 2023 | 3.12 | 4.68 | 2.21 |
| 2022 | 2.72 | 3.69 | 2.09 |
| 2021 | 5.06 | 9.04 | 3.13 |
| 2020 | 1.79 | 4.78 | 0.84 |
| 2019 | 1.43 | 1.86 | 1.03 |
| 2018 | 1.15 | 1.49 | 0.82 |
| 2017 | 1.63 | 2.44 | 1.17 |
| 2016 | 2.61 | 3.15 | 1.91 |
| 2015 | 2.8 | 3.9 | 1.8 |
| 2014 | 1.2 | 1.89 | 0.88 |
| 2013 | 0.93 | 1.14 | 0.79 |
| 2012 | 0.87 | 1.12 | 0.71 |
| 2011 | 1.38 | 1.75 | 0.89 |
| 2010 | 1.4 | 1.77 | 1.09 |
| 2009 | 0.94 | 1.54 | 0.47 |
| 2008 | 0.81 | 1.46 | 0.35 |
| 2007 | 1.16 | 1.89 | 0.58 |
| 2006 | 0.62 | 0.76 | 0.5 |
| 2005 | 0.65 | 0.79 | 0.44 |
| 2004 | 1.06 | 1.95 | 0.67 |