| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.54 | 2.75 | 2.43 |
| 2024 | 2.63 | 3.05 | 2.24 |
| 2023 | 4.65 | 5.93 | 2.97 |
| 2022 | 5.34 | 7.4 | 4.53 |
| 2021 | 7.97 | 11.45 | 5.62 |
| 2020 | 8.23 | 11.98 | 5.36 |
| 2019 | 5.28 | 7.35 | 4.01 |
| 2018 | 4.01 | 4.9 | 3.47 |
| 2017 | 4.13 | 4.8 | 3.51 |
| 2016 | 4.46 | 5.12 | 3.61 |
| 2015 | 5.26 | 8.45 | 3.6 |
| 2014 | 6.59 | 10.07 | 3.83 |
| 2013 | 7.09 | 9.24 | 4.75 |
| 2012 | 4.07 | 5.09 | 2.81 |
| 2011 | 4.48 | 6.02 | 2.95 |
| 2010 | 4.8 | 6.49 | 3.6 |
| 2009 | 2.98 | 4.28 | 1.81 |
| 2008 | 2.84 | 5.16 | 1.44 |
| 2007 | 4.86 | 6.33 | 3.27 |
| 2006 | 2.95 | 4.07 | 2.38 |
| 2005 | 2.32 | 2.79 | 1.71 |
| 2004 | 2.99 | 3.78 | 2.37 |
| 2003 | 3.48 | 4.49 | 2.59 |
| 2002 | 5.09 | 5.44 | 4.79 |