| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.59 | 4.72 | 2.88 |
| 2024 | 2.88 | 3.92 | 1.71 |
| 2023 | 2.71 | 3.09 | 2.37 |
| 2022 | 1.98 | 2.97 | 1.5 |
| 2021 | 1.43 | 1.8 | 1.15 |
| 2020 | 1.3 | 1.66 | 1.04 |
| 2019 | 1.42 | 1.82 | 1.22 |
| 2018 | 1.78 | 2.29 | 1.19 |
| 2017 | 5 | 6.53 | 2.18 |
| 2016 | 6.09 | 7.98 | 5.18 |
| 2015 | 7.02 | 10.71 | 4.72 |
| 2014 | 5.41 | 6.02 | 4.87 |
| 2013 | 6.6 | 8.38 | 4.97 |
| 2012 | 10.13 | 12.94 | 6.24 |
| 2011 | 12.91 | 15.38 | 10.98 |
| 2010 | 0 | -27.19 | |
| 2009 | 0 | -10.1 | |
| 2008 | 0 | -6.8 | |
| 2007 | 15.86 | 29.51 | 5.86 |
| 2006 | 4.66 | 8.49 | 1.94 |
| 2005 | 2.29 | 3.21 | 1.43 |
| 2004 | 4.15 | 5.73 | 2.81 |
| 2003 | 5.81 | 7.21 | 3.97 |
| 2002 | 10.69 | 24.08 | 5.9 |
| 2001 | 30.07 | 37.14 | 23.77 |
| 2000 | 10.23 | 13.55 | 6.37 |
| 1999 | 7.34 | 9.54 | 4.4 |
| 1998 | 6.74 | 9.86 | 3.94 |
| 1997 | 6.67 | 9.54 | 4.85 |