| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.71 | 11.97 | 4.18 |
| 2024 | 5.56 | 12.37 | 3.1 |
| 2023 | 9.18 | 16.12 | 4.5 |
| 2022 | 28.99 | 64.64 | 14.28 |
| 2021 | 37.71 | 67.93 | 24.36 |
| 2020 | 17.11 | 33.07 | 7.72 |
| 2019 | 7.09 | 9.31 | 4.64 |
| 2018 | 6.27 | 9.63 | 2.02 |
| 2017 | 4.86 | 7.73 | 2.75 |
| 2016 | 7.02 | 17.2 | 2.84 |
| 2015 | 7.03 | 22.65 | 2.13 |
| 2014 | 1.33 | 2.44 | 0.74 |
| 2013 | 0.96 | 1.23 | 0.73 |
| 2012 | 1.06 | 1.25 | 0.84 |
| 2011 | 1.19 | 1.62 | 0.91 |
| 2010 | 1.02 | 1.26 | 0.73 |
| 2009 | 0.87 | 1.22 | 0.55 |
| 2008 | 0.96 | 1.81 | 0.44 |
| 2007 | 1.5 | 2.56 | 0.91 |
| 2006 | 0.9 | 1.15 | 0.6 |
| 2005 | 0.91 | 1.1 | 0.76 |
| 2004 | 1.86 | 3.55 | 1.02 |