| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.51 | 3.23 | 1.91 |
| 2024 | 1.92 | 2.35 | 1.54 |
| 2023 | 2.56 | 2.79 | 2.23 |
| 2022 | 2.67 | 3.36 | 2.04 |
| 2021 | 2.45 | 3.62 | 2.13 |
| 2020 | 2.35 | 2.99 | 1.95 |
| 2019 | 2.52 | 3.13 | 2.07 |
| 2018 | 3.11 | 4.21 | 2.12 |
| 2017 | 4.75 | 5.94 | 3.86 |
| 2016 | 6.62 | 14.63 | 4.66 |
| 2015 | 11.13 | 17.32 | 6.49 |
| 2014 | 5.37 | 8.49 | 3.19 |
| 2013 | 4.77 | 6.18 | 3.78 |
| 2012 | 4.54 | 6.77 | 2.88 |
| 2011 | 8.2 | 12.02 | 5.82 |
| 2010 | 7.31 | 10.75 | 4.35 |
| 2009 | 6.01 | 7.97 | 2.71 |
| 2008 | 3.35 | 6.23 | 1.69 |
| 2007 | 5.38 | 8.43 | 2.73 |
| 2006 | 2.41 | 3.47 | 1.34 |
| 2005 | 1.44 | 1.97 | 0.92 |
| 2004 | 2.47 | 3.35 | 1.91 |