| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.03 | 2.28 | 1.81 |
| 2024 | 2.26 | 2.94 | 1.7 |
| 2023 | 3.86 | 7.38 | 2.54 |
| 2022 | 4.6 | 5.92 | 3.6 |
| 2021 | 3.93 | 5.93 | 2.87 |
| 2020 | 5.95 | 8.73 | 4.29 |
| 2019 | 7.13 | 8.99 | 6.1 |
| 2018 | 10.95 | 14.67 | 6.4 |
| 2017 | 15.32 | 19.61 | 11.39 |
| 2016 | 19.29 | 25.78 | 15.87 |
| 2015 | 15.33 | 25.51 | 8.99 |
| 2014 | 9.66 | 11.31 | 7.85 |
| 2013 | 7.59 | 9.96 | 6.26 |
| 2012 | 7.26 | 8.94 | 5.71 |
| 2011 | 0 | -22.09 | |
| 2010 | 0 | -11.28 | |
| 2009 | 2.54 | 3.32 | 1.78 |
| 2008 | 1.77 | 2.02 | 1.47 |
| 2007 | 13.56 | 20.71 | 7.28 |
| 2006 | 7.7 | 9.46 | 6.08 |
| 2005 | 8.8 | 10.54 | 6.96 |
| 2004 | 11.99 | 16.8 | 9.42 |
| 2003 | 237.49 | 811.8 | 71.19 |
| 2002 | 76.59 | 113.56 | 9.23 |
| 2001 | 24.36 | 42.17 | 15.84 |
| 2000 | 30.91 | 44.27 | 13.81 |
| 1999 | 20.71 | 26.96 | 10.79 |
| 1998 | 6.07 | 9.99 | 3.11 |
| 1997 | 4.92 | 6.49 | 3.21 |