| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 0.86 | 1.03 | 0.68 |
| 2023 | 1.05 | 1.53 | 0.73 |
| 2022 | 1.41 | 1.59 | 1.21 |
| 2021 | 1.03 | 1.46 | 0.73 |
| 2020 | 1.38 | 1.83 | 0.98 |
| 2019 | 1.25 | 1.59 | 1.08 |
| 2018 | 1.81 | 2.84 | 1.1 |
| 2017 | 3.69 | 7.11 | 2.08 |
| 2016 | 11.83 | 118.18 | 4.26 |
| 2015 | 3.15 | 4.85 | 1.72 |
| 2014 | 2.05 | 2.75 | 1.68 |
| 2013 | 1.9 | 2.74 | 1.39 |
| 2012 | 1.68 | 2.1 | 1.19 |
| 2011 | 2.42 | 3.02 | 1.59 |
| 2010 | 2.91 | 3.5 | 2.18 |
| 2009 | 1.89 | 3.57 | 0.83 |
| 2008 | 1.55 | 3.24 | 0.64 |
| 2007 | 2.3 | 3.25 | 1.06 |
| 2006 | 1.04 | 1.2 | 0.88 |
| 2005 | 1.14 | 1.55 | 0.88 |
| 2004 | 1.61 | 2.84 | 1 |