| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 12.12 | 90.13 | 0.5 |
| 2024 | 0.52 | 1.03 | 0.34 |
| 2023 | 0.63 | 0.98 | 0.52 |
| 2022 | 0.6 | 0.8 | 0.44 |
| 2021 | 0.61 | 0.81 | 0.48 |
| 2020 | 0.78 | 0.99 | 0.63 |
| 2019 | 1.03 | 1.49 | 0.79 |
| 2018 | 1.63 | 2.4 | 0.96 |
| 2017 | 3.37 | 4.43 | 2.34 |
| 2016 | 4.05 | 5.38 | 3.53 |
| 2015 | 5.72 | 8.59 | 4.22 |
| 2014 | 4.4 | 5.54 | 3.75 |
| 2013 | 6.42 | 10.35 | 4.79 |
| 2012 | 6.57 | 7.95 | 5.42 |
| 2011 | 8.49 | 12.82 | 6.91 |
| 2010 | 8.17 | 11.8 | 6 |
| 2009 | 5.06 | 6.31 | 3.99 |
| 2008 | 7.22 | 10.46 | 3.08 |
| 2007 | 8.17 | 11.97 | 4.29 |
| 2006 | 3.52 | 4.62 | 2.55 |
| 2005 | 2.59 | 3.49 | 1.81 |
| 2004 | 5.44 | 9.03 | 3.23 |
| 2003 | 7.24 | 8.84 | 6.4 |
| 2002 | 8.03 | 9.01 | 5.82 |
| 2001 | 9.59 | 12.56 | 7.16 |
| 2000 | 4.69 | 7.1 | 3.18 |
| 1999 | 3.99 | 5.36 | 3.09 |