| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.77 | 0.89 | 0.65 |
| 2024 | 0.58 | 0.83 | 0.4 |
| 2023 | 0.61 | 0.91 | 0.47 |
| 2022 | 0.83 | 1.05 | 0.59 |
| 2021 | 1.2 | 1.82 | 0.88 |
| 2020 | 1.88 | 2.97 | 1.1 |
| 2019 | 3.66 | 5.95 | 1.98 |
| 2018 | 1.94 | 2.72 | 1.5 |
| 2017 | 2.78 | 4.24 | 1.86 |
| 2016 | 4.07 | 5.62 | 2.19 |
| 2015 | 5.14 | 7.96 | 2.9 |
| 2014 | 5.6 | 7.8 | 4.63 |
| 2013 | 5.76 | 7.74 | 3.98 |
| 2012 | 6.65 | 9.11 | 4.14 |
| 2011 | 11.53 | 19.72 | 4.08 |
| 2010 | 11.2 | 27.98 | 5.44 |
| 2009 | 7.65 | 11.28 | 2.7 |
| 2008 | 0 | ||
| 2007 | 1.61 | 2.83 | 0.73 |
| 2006 | 0.83 | 1.12 | 0.62 |
| 2005 | 0.78 | 1.08 | 0.53 |
| 2004 | 1.36 | 2.7 | 0.69 |