| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.09 | 3.59 | 2.57 |
| 2024 | 2.59 | 4.86 | 1.72 |
| 2023 | 0.67 | 2.32 | 0.29 |
| 2022 | 0.68 | 1.13 | 0.47 |
| 2021 | 0.52 | 0.81 | 0.37 |
| 2020 | 0.56 | 0.72 | 0.38 |
| 2019 | 0.7 | 0.97 | 0.54 |
| 2018 | 1.25 | 1.6 | 0.74 |
| 2017 | 2.01 | 3 | 1.24 |
| 2016 | 3.3 | 4.49 | 2.6 |
| 2015 | 5.74 | 9.82 | 3.84 |
| 2014 | 4.16 | 5.02 | 3.12 |
| 2013 | 3.09 | 4.17 | 2.35 |
| 2012 | 4.29 | 6.72 | 3.12 |
| 2011 | 7.83 | 10.53 | 5.36 |
| 2010 | 0 | ||
| 2009 | 0 | ||
| 2008 | 0 | ||
| 2007 | 0 | ||
| 2006 | 0.76 | 1.29 | 0.59 |
| 2005 | 0.62 | 0.95 | 0.37 |
| 2004 | 0.88 | 1.36 | 0.49 |