| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.89 | 0.99 | 0.81 |
| 2024 | 1.07 | 1.3 | 0.92 |
| 2023 | 0.98 | 1.59 | 0.75 |
| 2022 | 0.83 | 1.12 | 0.68 |
| 2021 | 0.93 | 1.06 | 0.84 |
| 2020 | 1.23 | 1.78 | 0.93 |
| 2019 | 1.36 | 1.84 | 1.16 |
| 2018 | 1.5 | 2.08 | 0.95 |
| 2017 | 2.6 | 3.12 | 1.96 |
| 2016 | 2.91 | 3.29 | 2.43 |
| 2015 | 3.7 | 5.61 | 2.53 |
| 2014 | 2.66 | 3.44 | 2.12 |
| 2013 | 2.28 | 2.89 | 1.8 |
| 2012 | 2.34 | 2.96 | 1.71 |
| 2011 | 24.4 | 148.66 | 2.01 |
| 2010 | 47.47 | 144.79 | 29.46 |
| 2009 | 12.8 | 32.68 | 1.81 |
| 2008 | 2.78 | 3.77 | 1.32 |
| 2007 | 2.82 | 4.54 | 1.43 |
| 2006 | 1.5 | 1.81 | 1.24 |
| 2005 | 1.7 | 2.3 | 1.19 |
| 2004 | 2.76 | 3.58 | 2.16 |
| 2003 | 3.7 | 4.79 | 2.73 |