| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.41 | 2.53 | 2.24 |
| 2024 | 2.48 | 3.01 | 1.96 |
| 2023 | 2.1 | 2.44 | 1.9 |
| 2022 | 2.32 | 3.15 | 2.06 |
| 2021 | 2.8 | 3.1 | 2.53 |
| 2020 | 3.01 | 3.33 | 2.67 |
| 2019 | 3.26 | 3.73 | 2.98 |
| 2018 | 3.59 | 4.64 | 2.95 |
| 2017 | 5.34 | 6.06 | 4.4 |
| 2016 | 5.57 | 6.36 | 4.69 |
| 2015 | 8.67 | 13.67 | 5.41 |
| 2014 | 6.47 | 9.64 | 5.41 |
| 2013 | 6.89 | 8.65 | 4.08 |
| 2012 | 4.48 | 6.18 | 3.68 |
| 2011 | 9.9 | 19.96 | 5.78 |
| 2010 | 4.79 | 9.01 | 1.72 |
| 2009 | 1.26 | 2.08 | 0.52 |
| 2008 | 1.37 | 3.28 | 0.38 |
| 2007 | 2.96 | 4.55 | 1.39 |
| 2006 | 1.92 | 2.66 | 1.26 |
| 2005 | 1.63 | 2.23 | 1.3 |
| 2004 | 2.47 | 4.42 | 1.41 |