| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.63 | 7.82 | 3.8 |
| 2024 | 4.04 | 5.89 | 2.91 |
| 2023 | 6.44 | 8.86 | 5.01 |
| 2022 | 9.04 | 19.78 | 5.22 |
| 2021 | 17.55 | 26.09 | 14.39 |
| 2020 | 18.75 | 24.71 | 11.77 |
| 2019 | 10.54 | 14.05 | 6.81 |
| 2018 | 8.27 | 11.8 | 5.91 |
| 2017 | 5.39 | 7.46 | 3.8 |
| 2016 | 6.03 | 8.79 | 4.65 |
| 2015 | 13.57 | 25.76 | 8.69 |
| 2014 | 6.31 | 10.24 | 4.42 |
| 2013 | 4.03 | 5.43 | 2.86 |
| 2012 | 5.06 | 6.31 | 2.96 |
| 2011 | 7.15 | 8.44 | 5.73 |
| 2010 | 8.07 | 9.89 | 6.31 |
| 2009 | 5.92 | 8.52 | 5.12 |
| 2008 | 6.04 | 11.15 | 2.69 |
| 2007 | 7.72 | 9.95 | 5.62 |
| 2006 | 3.86 | 6.19 | 2.3 |
| 2005 | 2.49 | 3.18 | 1.81 |
| 2004 | 3.16 | 4.09 | 2.21 |
| 2003 | 4.42 | 5.37 | 3.21 |
| 2002 | 4.81 | 5.66 | 4 |