| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 0 | -0.33 | |
| 2021 | 2.08 | 2.08 | 2.08 |
| 2020 | 0.91 | 1.95 | 0.45 |
| 2019 | 0.65 | 0.88 | 0.49 |
| 2018 | 0.92 | 1.25 | 0.71 |
| 2017 | 1.71 | 3.11 | 1.09 |
| 2016 | 6.81 | 17.03 | 2.9 |
| 2015 | 4.4 | 8.77 | 2.52 |
| 2014 | 2.14 | 2.52 | 1.74 |
| 2013 | 2 | 2.25 | 1.67 |
| 2012 | 2.57 | 3.44 | 1.72 |
| 2011 | 4.16 | 6.02 | 2.25 |
| 2010 | 3.45 | 4.37 | 2.64 |
| 2009 | 3.08 | 4.41 | 1.63 |
| 2008 | 3.53 | 7.37 | 1.21 |
| 2007 | 5.86 | 7.89 | 2.87 |
| 2006 | 5.28 | 7.82 | 2.43 |
| 2005 | 4.5 | 6.92 | 1.61 |
| 2004 | 2.27 | 4 | 1.54 |