| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.68 | 1.99 | 1.43 |
| 2025 | 1.47 | 1.88 | 1.07 |
| 2024 | 1.17 | 1.68 | 0.85 |
| 2023 | 1.55 | 1.78 | 1.32 |
| 2022 | 1.43 | 1.85 | 1.18 |
| 2021 | 1.3 | 1.8 | 1.14 |
| 2020 | 1.42 | 1.94 | 1.11 |
| 2019 | 1.16 | 1.63 | 0.96 |
| 2018 | 1.76 | 2.46 | 1.14 |
| 2017 | 3.14 | 4.39 | 2.08 |
| 2016 | 3.75 | 4.36 | 2.82 |
| 2015 | 5.47 | 8.99 | 3.36 |
| 2014 | 5.31 | 6.73 | 3.99 |
| 2013 | 4.6 | 5.48 | 3.39 |
| 2012 | 3.42 | 4.15 | 2.73 |
| 2011 | 4.25 | 5.36 | 3.18 |
| 2010 | 4.16 | 5.71 | 2.98 |
| 2009 | 2.5 | 3.61 | 1.55 |
| 2008 | 2.1 | 3.81 | 1.26 |
| 2007 | 2.39 | 3.95 | 1.36 |
| 2006 | 1.57 | 2.29 | 1.13 |
| 2005 | 1.71 | 2.13 | 1.24 |