| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.57 | 3.72 | 2.04 |
| 2023 | 2.65 | 3.14 | 2.3 |
| 2022 | 2.5 | 3.22 | 2.14 |
| 2021 | 3.73 | 4.61 | 3.11 |
| 2020 | 5.06 | 6.35 | 4.28 |
| 2019 | 4.91 | 6.38 | 3.36 |
| 2018 | 4.35 | 6.27 | 2.77 |
| 2017 | 6.32 | 6.82 | 5.81 |
| 2016 | 20.04 | 31.24 | 3.74 |
| 2015 | 12.24 | 27.73 | 2.06 |
| 2014 | 0.82 | 2.88 | 0.53 |
| 2013 | 0.64 | 0.84 | 0.51 |
| 2012 | 0.77 | 1.09 | 0.54 |
| 2011 | 2.17 | 3.46 | 0.83 |
| 2010 | 3.56 | 4.44 | 2.72 |
| 2009 | 2.53 | 4.27 | 1.22 |
| 2008 | 2.19 | 4.79 | 0.93 |
| 2007 | 2.25 | 4.06 | 0.95 |
| 2006 | 1.04 | 1.46 | 0.87 |
| 2005 | 0.88 | 1.2 | 0.66 |
| 2004 | 1.35 | 2.19 | 0.78 |