| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.9 | 4.42 | 2.35 |
| 2024 | 2.44 | 3.59 | 1.82 |
| 2023 | 3.22 | 4.08 | 2.64 |
| 2022 | 2.85 | 3.73 | 2.11 |
| 2021 | 2.83 | 3.49 | 2.45 |
| 2020 | 3.06 | 4.29 | 2.47 |
| 2019 | 3.13 | 4.02 | 2.67 |
| 2018 | 3.17 | 4.37 | 2.48 |
| 2017 | 5.94 | 9.23 | 4.09 |
| 2016 | 6.98 | 9.29 | 5.73 |
| 2015 | 7.55 | 13.11 | 4.42 |
| 2014 | 5.22 | 7.65 | 3.89 |
| 2013 | 4.47 | 5.52 | 3.59 |
| 2012 | 4.85 | 6.46 | 3.22 |
| 2011 | 6.99 | 8.73 | 4.34 |
| 2010 | 6.83 | 9.74 | 4.23 |
| 2009 | 0 | -1.82 | |
| 2008 | 0 | -1.56 | |
| 2007 | 0 | -3.04 | |
| 2006 | 0 | -3.26 | |
| 2005 | 0 | -2.83 | |
| 2004 | 9.41 | 11.54 | 7.77 |
| 2003 | 18.38 | 29.78 | 3.23 |
| 2002 | 3.96 | 5.31 | 1.74 |
| 2001 | 3.38 | 4.14 | 2.48 |
| 2000 | 3.83 | 5 | 2.58 |
| 1999 | 2.38 | 3.59 | 1.73 |
| 1998 | 3.03 | 4.58 | 1.84 |
| 1997 | 2.88 | 3.9 | 2.1 |