| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 0 | ||
| 2021 | 0 | ||
| 2020 | 1.01 | 2.31 | 0.21 |
| 2019 | 1.75 | 3.16 | 1.1 |
| 2018 | 2.16 | 3.63 | 1.1 |
| 2017 | 3.5 | 4.09 | 2.98 |
| 2016 | 3.32 | 4.51 | 2.3 |
| 2015 | 3.7 | 6.27 | 2.33 |
| 2014 | 2.23 | 3.18 | 1.48 |
| 2013 | 1.65 | 2.73 | 1.2 |
| 2012 | 1.34 | 1.66 | 1.12 |
| 2011 | 1.8 | 2.19 | 1.16 |
| 2010 | 2.79 | 4.2 | 1.55 |
| 2009 | 2.16 | 4.09 | 0.56 |
| 2008 | 0.89 | 1.74 | 0.43 |
| 2007 | 1.35 | 2.6 | 0.5 |
| 2006 | 0.75 | 1.19 | 0.44 |
| 2005 | 1.51 | 2.02 | 1.05 |
| 2004 | 4.3 | 11.66 | 1.76 |