| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.99 | 8.78 | 6.96 |
| 2024 | 9 | 13.37 | 6.76 |
| 2023 | 6.22 | 13.02 | 1.51 |
| 2022 | 1.97 | 2.78 | 1.3 |
| 2021 | 2.05 | 2.62 | 1.81 |
| 2020 | 2.01 | 2.79 | 1.58 |
| 2019 | 6.35 | 11.07 | 2.18 |
| 2018 | 5.76 | 12.7 | 2.65 |
| 2017 | 4.79 | 7.99 | 3.69 |
| 2016 | 7.81 | 12.55 | 5.07 |
| 2015 | 14.27 | 30.07 | 6.47 |
| 2014 | 12.43 | 17.32 | 7.94 |
| 2013 | 16.59 | 22.16 | 12.11 |
| 2012 | 12.25 | 15.71 | 8.54 |
| 2011 | 15.76 | 17.43 | 13.84 |
| 2010 | 15.03 | 17.43 | 11.29 |
| 2009 | 9.52 | 12.19 | 5.21 |
| 2008 | 12.86 | 26.93 | 3.72 |
| 2007 | 20.58 | 32.27 | 8.99 |
| 2006 | 8.2 | 30.72 | 1 |
| 2005 | 1.62 | 2.39 | 1.27 |
| 2004 | 2.66 | 4.61 | 1.58 |