| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.7 | 0.75 | 0.65 |
| 2024 | 0.7 | 0.82 | 0.58 |
| 2023 | 0.78 | 1.06 | 0.63 |
| 2022 | 0.67 | 0.8 | 0.6 |
| 2021 | 0.66 | 0.84 | 0.58 |
| 2020 | 0.66 | 0.88 | 0.54 |
| 2019 | 0.95 | 1.26 | 0.75 |
| 2018 | 1.12 | 1.51 | 0.88 |
| 2017 | 1.67 | 2.23 | 1.29 |
| 2016 | 60.91 | 107.43 | 3.95 |
| 2015 | 4.9 | 7.56 | 2.95 |
| 2014 | 2.77 | 3.52 | 2.05 |
| 2013 | 2.11 | 2.81 | 1.63 |
| 2012 | 2.48 | 3.31 | 1.91 |
| 2011 | 4.3 | 6.37 | 2.35 |
| 2010 | 4.34 | 5.56 | 3.14 |
| 2009 | 3.31 | 4.42 | 2.16 |
| 2008 | 3.67 | 6.34 | 1.81 |
| 2007 | 4.69 | 8.36 | 2.07 |
| 2006 | 1.99 | 2.46 | 1.4 |
| 2005 | 2.42 | 3.6 | 1.32 |
| 2004 | 4.49 | 6.26 | 3.15 |
| 2003 | 7.38 | 8.96 | 3.97 |
| 2002 | 6.82 | 7.48 | 4.9 |
| 2001 | 6.95 | 8.1 | 6.02 |