| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2 | 2.27 | 1.77 |
| 2024 | 1.11 | 2.83 | 0.54 |
| 2023 | 0.46 | 0.89 | 0.32 |
| 2022 | 0.37 | 0.44 | 0.32 |
| 2021 | 0.41 | 0.5 | 0.34 |
| 2020 | 0.48 | 0.58 | 0.34 |
| 2019 | 0.49 | 0.65 | 0.41 |
| 2018 | 0.68 | 0.94 | 0.36 |
| 2017 | 0.96 | 1.46 | 0.72 |
| 2016 | 0.83 | 1.11 | 0.59 |
| 2015 | 0.99 | 1.5 | 0.56 |
| 2014 | 0.66 | 1.02 | 0.52 |
| 2013 | 2.28 | 6.84 | 0.58 |
| 2012 | 5.51 | 7.15 | 4.38 |
| 2011 | 5.45 | 7.02 | 4.41 |
| 2010 | 11.22 | 18.84 | 5.8 |
| 2009 | 6.31 | 12.31 | 2.68 |
| 2008 | 7.28 | 17.01 | 2.16 |
| 2007 | 13.46 | 23.38 | 7.44 |
| 2006 | 5.5 | 9.38 | 2.06 |
| 2005 | 2.25 | 2.61 | 1.7 |
| 2004 | 3.37 | 6.34 | 2.34 |