| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.89 | 2.38 | 1.51 |
| 2024 | 1.87 | 3.1 | 1.05 |
| 2023 | 5.27 | 9 | 2.81 |
| 2022 | 3.83 | 5.09 | 3.03 |
| 2021 | 3.93 | 4.89 | 3.2 |
| 2020 | 3.27 | 4.16 | 2.37 |
| 2019 | 3.06 | 4.48 | 1.35 |
| 2018 | 1.51 | 2.28 | 0.97 |
| 2017 | 8.44 | 26.43 | 1.22 |
| 2016 | 9.17 | 21.33 | 5.37 |
| 2015 | 10.35 | 18.98 | 4.96 |
| 2014 | 4.96 | 7.28 | 3.11 |
| 2013 | 6.27 | 8.32 | 4.45 |
| 2012 | 5.54 | 6.93 | 4.41 |
| 2011 | 7.91 | 13.34 | 4.62 |
| 2010 | 3.77 | 5.04 | 2.64 |
| 2009 | 4.53 | 5.58 | 3.03 |
| 2008 | 6.44 | 18.8 | 1.77 |
| 2007 | 10.28 | 26.93 | 2.47 |
| 2006 | 2.11 | 2.87 | 1.38 |
| 2005 | 1.82 | 2.83 | 0.68 |
| 2004 | 1.32 | 1.95 | 0.95 |