| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.84 | 1.01 | 0.78 |
| 2024 | 0.8 | 0.99 | 0.66 |
| 2023 | 1.16 | 1.64 | 0.86 |
| 2022 | 1.78 | 2.42 | 1.18 |
| 2021 | 2.31 | 2.98 | 1.77 |
| 2020 | 3.51 | 4.3 | 2.45 |
| 2019 | 2.71 | 3.78 | 2.21 |
| 2018 | 3.58 | 5.99 | 2.22 |
| 2017 | 5.44 | 8.06 | 3.75 |
| 2016 | 3.59 | 8.78 | 2.57 |
| 2015 | 4.61 | 5.55 | 3.45 |
| 2014 | 3.15 | 4.74 | 2.46 |
| 2013 | 82.78 | 203.57 | 2.98 |
| 2012 | 0 | ||
| 2011 | 0 | ||
| 2010 | 0 | ||
| 2009 | 0 | ||
| 2008 | 0 | ||
| 2007 | 17.05 | 26.56 | 11 |
| 2006 | 6.73 | 14.1 | 2.01 |
| 2005 | 2.48 | 3.42 | 1.39 |
| 2004 | 2.98 | 4.21 | 2 |
| 2003 | 3.54 | 4.57 | 2.64 |
| 2002 | 5.67 | 6.35 | 4.85 |
| 2001 | 11.5 | 19.08 | 6.26 |
| 2000 | 14.8 | 18.94 | 7.52 |
| 1999 | 8.04 | 9.66 | 6.08 |
| 1998 | 7.15 | 10.8 | 4.66 |
| 1997 | 6.02 | 8.01 | 4.77 |