| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 0 | ||
| 2023 | 0 | -0.81 | |
| 2022 | 0 | -1.32 | |
| 2021 | 11.62 | 25.94 | 5.08 |
| 2020 | 6.04 | 9.18 | 4.54 |
| 2019 | 6.23 | 9.01 | 5 |
| 2018 | 6.44 | 9.54 | 3.75 |
| 2017 | 7.3 | 11.3 | 4.77 |
| 2016 | 7.86 | 11.36 | 4.09 |
| 2015 | 9.32 | 11.85 | 6.05 |
| 2014 | 6.31 | 9.69 | 3.6 |
| 2013 | 3.56 | 4.54 | 2.41 |
| 2012 | 4.49 | 5.67 | 3.35 |
| 2011 | 14.65 | 25.33 | 3.45 |
| 2010 | 20.07 | 28.99 | 14.27 |
| 2009 | 24.62 | 40.39 | 16.15 |
| 2008 | 0 | -6.19 | |
| 2007 | 19.83 | 27.87 | 14.35 |
| 2006 | 7.26 | 15.38 | 2.18 |
| 2005 | 2.95 | 4.19 | 1.92 |
| 2004 | 5.25 | 10.11 | 3.34 |
| 2003 | 8.74 | 10.66 | 6.33 |
| 2002 | 12.34 | 15.82 | 6.62 |
| 2001 | 11.61 | 14.7 | 9.57 |
| 2000 | 11 | 14.13 | 8.71 |
| 1999 | 8.01 | 11.14 | 5.37 |