| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.14 | 1.19 | 1.05 |
| 2025 | 1.16 | 1.33 | 0.97 |
| 2024 | 1.08 | 1.44 | 0.79 |
| 2023 | 2.02 | 2.9 | 1.39 |
| 2022 | 2.02 | 2.41 | 1.66 |
| 2021 | 2.01 | 2.86 | 1.57 |
| 2020 | 2.33 | 3.05 | 1.82 |
| 2019 | 2.01 | 2.63 | 1.75 |
| 2018 | 2.98 | 4.36 | 1.9 |
| 2017 | 5.65 | 7.77 | 3.94 |
| 2016 | 7.47 | 9.73 | 5.09 |
| 2015 | 7.23 | 12.58 | 4.98 |
| 2014 | 20.86 | 56.71 | 4.89 |
| 2013 | 17.12 | 58.62 | 3.17 |
| 2012 | 2.27 | 3.27 | 1.38 |
| 2011 | 2.65 | 3.55 | 1.41 |
| 2010 | 2.43 | 3.19 | 1.52 |
| 2009 | 1.44 | 2.07 | 0.9 |
| 2008 | 1.42 | 2.38 | 0.56 |
| 2007 | 1.44 | 2.08 | 0.75 |
| 2006 | 1.21 | 2.15 | 0.73 |
| 2005 | 2.15 | 2.89 | 1.41 |
| 2004 | 2.88 | 5.75 | 1.68 |