| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.89 | 0.97 | 0.75 |
| 2024 | 0.6 | 1.12 | 0.44 |
| 2023 | 0.7 | 1.29 | 0.49 |
| 2022 | 0.6 | 0.81 | 0.45 |
| 2021 | 0.44 | 0.51 | 0.35 |
| 2020 | 0.63 | 0.72 | 0.5 |
| 2019 | 0.82 | 1.03 | 0.67 |
| 2018 | 1 | 1.33 | 0.76 |
| 2017 | 1.82 | 2.38 | 1.25 |
| 2016 | 1.59 | 2.54 | 1.18 |
| 2015 | 15.75 | 28.82 | 2.64 |
| 2014 | 10.58 | 16.26 | 4.8 |
| 2013 | 5.31 | 7.58 | 3.8 |
| 2012 | 6.1 | 8.92 | 2.04 |
| 2011 | 4.77 | 7.75 | 2.18 |
| 2010 | 8.52 | 18.09 | 5.54 |
| 2009 | 10.03 | 16.55 | 6.89 |
| 2008 | 10.76 | 23.06 | 3.97 |
| 2007 | 11.08 | 19.51 | 8.79 |
| 2006 | 5.61 | 6.95 | 4.56 |
| 2005 | 5.71 | 8.71 | 3.94 |
| 2004 | 10.32 | 17.2 | 5.17 |