| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.39 | 2.94 | 1.81 |
| 2024 | 3.12 | 3.76 | 2.33 |
| 2023 | 4.13 | 6.24 | 3.12 |
| 2022 | 4.91 | 5.77 | 3.67 |
| 2021 | 3.8 | 6.42 | 2.78 |
| 2020 | 3.05 | 3.74 | 2.35 |
| 2019 | 4.98 | 14.7 | 1.99 |
| 2018 | 4.1 | 5.31 | 3.03 |
| 2017 | 5.22 | 6.34 | 4.47 |
| 2016 | 6.2 | 8.61 | 4.6 |
| 2015 | 7.65 | 12.12 | 5.29 |
| 2014 | 5.83 | 6.83 | 4.77 |
| 2013 | 4.63 | 5.65 | 3.81 |
| 2012 | 4.81 | 6.22 | 3.58 |
| 2011 | 7.24 | 10.13 | 4.54 |
| 2010 | 6.49 | 10.67 | 4.49 |
| 2009 | 5.07 | 7.78 | 2.65 |
| 2008 | 5.48 | 11.95 | 2.01 |
| 2007 | 8.07 | 13.72 | 2.23 |
| 2006 | 2.59 | 3.35 | 1.9 |
| 2005 | 1.89 | 2.46 | 1.31 |
| 2004 | 2.55 | 3.63 | 1.72 |
| 2003 | 3.07 | 3.95 | 2.33 |
| 2002 | 5 | 5.46 | 4.63 |