| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.79 | 0.85 | 0.74 |
| 2024 | 0.7 | 1.11 | 0.51 |
| 2023 | 0.84 | 1.26 | 0.67 |
| 2022 | 0.77 | 0.91 | 0.66 |
| 2021 | 0.96 | 1.3 | 0.81 |
| 2020 | 1.32 | 1.67 | 1.13 |
| 2019 | 1.69 | 2.27 | 1.38 |
| 2018 | 1.86 | 2.23 | 1.52 |
| 2017 | 2.42 | 2.72 | 2.11 |
| 2016 | 2.8 | 4.29 | 2.3 |
| 2015 | 5.19 | 8.11 | 2.74 |
| 2014 | 3.53 | 5.31 | 2.71 |
| 2013 | 4.65 | 5.66 | 3.88 |
| 2012 | 3.44 | 21.84 | 2.78 |
| 2011 | 0 | ||
| 2010 | 0 | ||
| 2009 | 0 | ||
| 2008 | 0 | ||
| 2007 | 2.25 | 3.77 | 1.28 |
| 2006 | 1.28 | 1.59 | 1.07 |
| 2005 | 1.32 | 1.63 | 1.11 |
| 2004 | 2.01 | 2.59 | 1.47 |
| 2003 | 2.38 | 2.84 | 1.98 |
| 2002 | 3.81 | 7.11 | 2.87 |
| 2001 | 7.59 | 8.83 | 5.15 |
| 2000 | 8.48 | 12.01 | 3.84 |
| 1999 | 4.88 | 6.86 | 3 |
| 1998 | 4.27 | 5.93 | 3.02 |
| 1997 | 3.81 | 5.37 | 2.95 |