| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.11 | 1.66 | 0.81 |
| 2023 | 1.71 | 2.3 | 1.32 |
| 2022 | 2.72 | 4.92 | 1.56 |
| 2021 | 4.43 | 6.69 | 3.35 |
| 2020 | 14.56 | 45.47 | 5 |
| 2019 | 9.37 | 26.57 | 3.49 |
| 2018 | 5.46 | 6.07 | 4 |
| 2017 | 4.22 | 6.48 | 2.66 |
| 2016 | 4.37 | 9.04 | 3.05 |
| 2015 | 4.86 | 10.77 | 2.53 |
| 2014 | 4.47 | 8.37 | 2.49 |
| 2013 | 4.94 | 6.68 | 3.49 |
| 2012 | 4.28 | 5.75 | 2.77 |
| 2011 | 5.46 | 8.13 | 2.79 |
| 2010 | 6.22 | 9.39 | 4.52 |
| 2009 | 8.77 | 13.1 | 5.07 |
| 2008 | 4.68 | 5.95 | 3.69 |
| 2007 | 0 | -0.85 | |
| 2006 | 0 | -0.69 | |
| 2005 | 1.98 | 2.48 | 1.31 |
| 2004 | 4.52 | 8.51 | 2.13 |
| 2003 | 9.98 | 12.41 | 7.38 |
| 2002 | 13.62 | 17.95 | 11.21 |
| 2001 | 15.82 | 17.69 | 13.97 |
| 2000 | 6.41 | 8.49 | 4.15 |
| 1999 | 3.14 | 4.38 | 2.44 |
| 1998 | 8.54 | 12.05 | 5.66 |
| 1997 | 11.75 | 17.37 | 5.49 |