| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.56 | 1.71 | 1.31 |
| 2024 | 1.07 | 1.97 | 0.78 |
| 2023 | 1.29 | 2.55 | 0.98 |
| 2022 | 1.46 | 2.1 | 0.94 |
| 2021 | 1.24 | 1.36 | 1.05 |
| 2020 | 1.51 | 1.72 | 1.35 |
| 2019 | 1.87 | 2.37 | 1.53 |
| 2018 | 2.24 | 2.93 | 1.76 |
| 2017 | 5.36 | 10.32 | 2.74 |
| 2016 | 8.8 | 12.09 | 7.38 |
| 2015 | 11.87 | 19.03 | 7.28 |
| 2014 | 5.58 | 9.18 | 3.59 |
| 2013 | 3.6 | 4.69 | 2.78 |
| 2012 | 3.36 | 4.11 | 2.21 |
| 2011 | 4.93 | 9.06 | 2.36 |
| 2010 | 9.29 | 11.66 | 7.17 |
| 2009 | 9.6 | 11.38 | 7.43 |
| 2008 | 36.21 | 132.85 | 4.51 |
| 2007 | 64.8 | 123.88 | 50.61 |
| 2006 | 0 | -0.29 | |
| 2005 | 0 | -0.25 | |
| 2004 | 5.66 | 6.37 | 4.47 |
| 2003 | 5.37 | 5.97 | 4.6 |
| 2002 | 0 | -1.64 | |
| 2001 | 12.39 | 16.05 | 9.4 |
| 2000 | 8.34 | 11.31 | 6.26 |
| 1999 | 5.89 | 7.39 | 4.91 |
| 1998 | 7.29 | 10.69 | 4.78 |
| 1997 | 6.32 | 11.22 | 2.83 |