| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 0 | ||
| 2025 | 0 | ||
| 2024 | 7.4 | 12.37 | 1.94 |
| 2023 | 13.2 | 20.68 | 9.17 |
| 2022 | 24.12 | 38.46 | 16.62 |
| 2021 | 34.76 | 51.97 | 23.7 |
| 2020 | 13.07 | 27.21 | 5.07 |
| 2019 | 1.87 | 8.55 | 0.74 |
| 2018 | 1.43 | 3.01 | 0.72 |
| 2017 | 3.71 | 5.2 | 2.01 |
| 2016 | 3.78 | 5.2 | 2.62 |
| 2015 | 2.68 | 2.74 | 2.62 |
| 2014 | 2.65 | 3.6 | 2.13 |
| 2013 | 2.48 | 2.89 | 2.05 |
| 2012 | 2.48 | 2.91 | 1.98 |
| 2011 | 2.96 | 3.71 | 2.2 |
| 2010 | 3.03 | 3.99 | 2.28 |
| 2009 | 1.78 | 2.59 | 0.94 |
| 2008 | 2.79 | 6.52 | 0.64 |
| 2007 | 4.6 | 7.08 | 1.81 |
| 2006 | 1.69 | 2.75 | 1.06 |
| 2005 | 0.91 | 1.37 | 0.56 |
| 2004 | 1.24 | 1.95 | 0.87 |