| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | -0.52 | |
| 2022 | 0 | -1.45 | |
| 2021 | 25.47 | 71.27 | 2.99 |
| 2020 | 3.47 | 5.06 | 1.39 |
| 2019 | 2.44 | 3.9 | 1.48 |
| 2018 | 4.69 | 5.81 | 2.6 |
| 2017 | 4.86 | 5.52 | 4.39 |
| 2016 | 5.9 | 10.07 | 4.31 |
| 2015 | 14.29 | 29.6 | 6.3 |
| 2014 | 3.78 | 8.08 | 2.21 |
| 2013 | 2.28 | 2.65 | 1.94 |
| 2012 | 1.84 | 2.23 | 1.34 |
| 2011 | 2.21 | 2.63 | 1.42 |
| 2010 | 2.98 | 3.79 | 2.24 |
| 2009 | 3.24 | 4.38 | 1.8 |
| 2008 | 4.17 | 9.1 | 1.49 |
| 2007 | 8.11 | 12.61 | 3.29 |
| 2006 | 2.15 | 3.32 | 1.2 |
| 2005 | 1.39 | 1.97 | 0.96 |
| 2004 | 2.5 | 3.68 | 1.66 |
| 2003 | 2.78 | 3.31 | 2.05 |
| 2002 | 3.63 | 4.54 | 2.06 |
| 2001 | 5.68 | 7.31 | 3.44 |