| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.13 | 1.86 | 0.98 |
| 2024 | 1.07 | 1.38 | 0.81 |
| 2023 | 1.84 | 2.39 | 1.14 |
| 2022 | 3.34 | 17.78 | 1.52 |
| 2021 | 4.18 | 6.52 | 1.65 |
| 2020 | 5.1 | 15.81 | 2.15 |
| 2019 | 4.25 | 15.48 | 1.18 |
| 2018 | 2.43 | 4.37 | 1.23 |
| 2017 | 4.68 | 6.07 | 3.73 |
| 2016 | 4.9 | 10.07 | 2.92 |
| 2015 | 6.9 | 11.96 | 3.18 |
| 2014 | 6.14 | 9.55 | 3.61 |
| 2013 | 3.51 | 4.67 | 2.77 |
| 2012 | 2.82 | 3.95 | 1.76 |
| 2011 | 3.7 | 6.23 | 1.81 |
| 2010 | 8.37 | 14.89 | 5.2 |
| 2009 | 16.13 | 25.46 | 3.4 |
| 2008 | 6.62 | 16.31 | 2.57 |
| 2007 | 12.4 | 15.56 | 5.94 |
| 2006 | 3.6 | 6.72 | 1.74 |
| 2005 | 1.74 | 2.31 | 1.13 |
| 2004 | 1.96 | 3.56 | 1.23 |