| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.92 | 2.7 | 1.58 |
| 2025 | 1.39 | 2.23 | 1.07 |
| 2024 | 1.09 | 1.57 | 0.73 |
| 2023 | 1.57 | 1.85 | 1.36 |
| 2022 | 1.82 | 2.25 | 1.6 |
| 2021 | 2.23 | 8.32 | 1.75 |
| 2020 | 3.57 | 9.66 | 1.48 |
| 2019 | 1.9 | 2.5 | 1.65 |
| 2018 | 1.81 | 2.17 | 1.49 |
| 2017 | 2.95 | 4.6 | 1.93 |
| 2016 | 3.84 | 4.95 | 2.7 |
| 2015 | 2.97 | 5.79 | 1.76 |
| 2014 | 1.72 | 2.47 | 1.04 |
| 2013 | 1.16 | 1.31 | 0.96 |
| 2012 | 1.19 | 1.51 | 0.98 |
| 2011 | 1.75 | 2.25 | 1.17 |
| 2010 | 1.82 | 2.25 | 1.35 |
| 2009 | 1.6 | 2.18 | 0.89 |
| 2008 | 1.53 | 3 | 0.7 |
| 2007 | 2.98 | 5.58 | 1.52 |
| 2006 | 1.53 | 1.99 | 0.99 |
| 2005 | 1.42 | 1.89 | 1.17 |
| 2004 | 1.95 | 2.24 | 1.73 |