| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.88 | 4.3 | 1.6 |
| 2024 | 2.74 | 5.46 | 1.47 |
| 2023 | 5.84 | 8.17 | 4.53 |
| 2022 | 5.48 | 9.1 | 4.02 |
| 2021 | 6.15 | 8.86 | 4.85 |
| 2020 | 5.89 | 10.15 | 4.53 |
| 2019 | 6.43 | 8.37 | 5.41 |
| 2018 | 7.61 | 9.62 | 4.74 |
| 2017 | 11.51 | 18.19 | 7.28 |
| 2016 | 17.23 | 26.34 | 12.87 |
| 2015 | 19.34 | 29.27 | 11.01 |
| 2014 | 9.98 | 15.87 | 5.54 |
| 2013 | 5.08 | 9.13 | 2.98 |
| 2012 | 3.53 | 4.94 | 2.71 |
| 2011 | 4.29 | 6.51 | 2.86 |
| 2010 | 7.09 | 10.61 | 4.65 |
| 2009 | 5.26 | 7.47 | 2.4 |
| 2008 | 7.75 | 26.15 | 1.46 |
| 2007 | 12.69 | 24.63 | 4.24 |
| 2006 | 3.18 | 4.89 | 1.68 |
| 2005 | 1.56 | 1.88 | 1.24 |
| 2004 | 2.6 | 4.16 | 1.65 |