| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.79 | 0.91 | 0.69 |
| 2024 | 0.63 | 1.01 | 0.33 |
| 2023 | 0.64 | 0.82 | 0.5 |
| 2022 | 0.64 | 0.83 | 0.52 |
| 2021 | 0.84 | 1.14 | 0.62 |
| 2020 | 0.88 | 1.25 | 0.71 |
| 2019 | 1.24 | 1.98 | 1 |
| 2018 | 2.2 | 4.29 | 1.15 |
| 2017 | 3.13 | 4.35 | 2.57 |
| 2016 | 3.12 | 3.79 | 2.31 |
| 2015 | 6.01 | 17.4 | 2.17 |
| 2014 | 1.56 | 2.78 | 1.19 |
| 2013 | 1.51 | 1.86 | 1.23 |
| 2012 | 1.54 | 2.45 | 1.09 |
| 2011 | 2.26 | 2.64 | 1.78 |
| 2010 | 2.47 | 3.21 | 1.77 |
| 2009 | 2.49 | 3.79 | 1.41 |
| 2008 | 31.96 | 110.38 | 1.07 |
| 2007 | 130.53 | 207.99 | 83.3 |
| 2006 | 0 | -15.32 | |
| 2005 | 0 | -5.25 | |
| 2004 | 0 | -4.72 | |
| 2003 | 0 | -4.95 | |
| 2002 | 6.45 | 7.87 | 4.66 |
| 2001 | 8.62 | 10.91 | 6.68 |
| 2000 | 6.41 | 9.17 | 3.97 |
| 1999 | 3.89 | 4.8 | 2.91 |
| 1998 | 3.38 | 4.68 | 2.53 |
| 1997 | 3.5 | 5.57 | 2.5 |