| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 11.16 | 12.59 | 4.57 |
| 2022 | 6.05 | 14.43 | 2.25 |
| 2021 | 3.73 | 5.89 | 1.98 |
| 2020 | 2.76 | 3.66 | 2.03 |
| 2019 | 3.52 | 4.48 | 2.46 |
| 2018 | 3.59 | 8.49 | 1.51 |
| 2017 | 9.12 | 21.44 | 4.44 |
| 2016 | 10.42 | 29.21 | 1.63 |
| 2015 | 2.56 | 4.58 | 1.66 |
| 2014 | 1.31 | 2 | 0.99 |
| 2013 | 1.36 | 1.83 | 1.13 |
| 2012 | 1.82 | 2.32 | 1.47 |
| 2011 | 3.1 | 4.55 | 1.69 |
| 2010 | 5.85 | 11.84 | 3.88 |
| 2009 | 13.2 | 15.54 | 11.42 |
| 2008 | 0 | -9.27 | |
| 2007 | 15.82 | 45.85 | 10.01 |
| 2006 | 26.13 | 65.05 | 1.96 |
| 2005 | 1.71 | 2.39 | 0.79 |
| 2004 | 1.83 | 2.59 | 1.33 |
| 2003 | 2.52 | 3.26 | 1.82 |
| 2002 | 3.35 | 3.96 | 2.59 |
| 2001 | 5.3 | 6.55 | 3.42 |
| 2000 | 5.35 | 7.13 | 3.75 |