| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.94 | 11.14 | 6.08 |
| 2024 | 5.55 | 8.74 | 3.63 |
| 2023 | 7.79 | 9.9 | 6.51 |
| 2022 | 6.1 | 10.94 | 3.48 |
| 2021 | 3.3 | 4.88 | 2.66 |
| 2020 | 4.65 | 6.24 | 3.43 |
| 2019 | 5.9 | 10.68 | 4.27 |
| 2018 | 7.92 | 14.68 | 4.48 |
| 2017 | 17.66 | 27.97 | 12.1 |
| 2016 | 24.14 | 33.74 | 9.9 |
| 2015 | 10.88 | 23.68 | 3.9 |
| 2014 | 2.6 | 5.1 | 1.15 |
| 2013 | 1.53 | 2.06 | 1.14 |
| 2012 | 1.71 | 1.97 | 1.28 |
| 2011 | 1.72 | 2.48 | 1.05 |
| 2010 | 1.88 | 2.39 | 1.52 |
| 2009 | 1.39 | 1.75 | 0.71 |
| 2008 | 1.73 | 3.46 | 0.6 |
| 2007 | 2.57 | 3.72 | 1.34 |
| 2006 | 1.04 | 1.45 | 0.68 |
| 2005 | 0.81 | 1 | 0.62 |
| 2004 | 1.1 | 1.72 | 0.69 |