| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 18.92 | 23.43 | 17.21 |
| 2022 | 31.03 | 40.4 | 21.27 |
| 2021 | 0.7 | 0.9 | 0.51 |
| 2020 | 1.33 | 3.92 | 0.34 |
| 2019 | 1.05 | 3.08 | 0.33 |
| 2018 | 0.85 | 1.51 | 0.31 |
| 2017 | 1.56 | 1.8 | 1.31 |
| 2016 | 1.66 | 2.06 | 1.43 |
| 2015 | 1.13 | 2.21 | 0.61 |
| 2014 | 0.71 | 1.03 | 0.56 |
| 2013 | 0.95 | 1.37 | 0.7 |
| 2012 | 2.39 | 8.29 | 0.96 |
| 2011 | 30.09 | 113.88 | 4.99 |
| 2010 | 20.35 | 23.9 | 16.55 |
| 2009 | 16.85 | 29.57 | 10.13 |
| 2008 | 10.8 | 17.89 | 5.46 |
| 2007 | 6.27 | 10.41 | 2.12 |
| 2006 | 1.86 | 2.48 | 1.18 |
| 2005 | 2.25 | 3.21 | 1.06 |
| 2004 | 1.49 | 3.39 | 0.79 |