| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.15 | 2.28 | 1.95 |
| 2024 | 1.84 | 2.18 | 1.49 |
| 2023 | 1.36 | 1.6 | 1.04 |
| 2022 | 1.03 | 1.18 | 0.93 |
| 2021 | 0.93 | 1.13 | 0.79 |
| 2020 | 0.85 | 0.99 | 0.79 |
| 2019 | 0.98 | 1.21 | 0.86 |
| 2018 | 1.31 | 2.15 | 0.86 |
| 2017 | 2.57 | 3.38 | 1.93 |
| 2016 | 2.8 | 3.66 | 1.98 |
| 2015 | 2.26 | 4.25 | 1.26 |
| 2014 | 1.05 | 1.45 | 0.87 |
| 2013 | 0.98 | 1.16 | 0.82 |
| 2012 | 1.1 | 1.28 | 0.96 |
| 2011 | 1.5 | 1.97 | 1.14 |
| 2010 | 1.95 | 2.65 | 1.6 |
| 2009 | 1.71 | 2.08 | 1.31 |
| 2008 | 2.06 | 3.65 | 1.23 |
| 2007 | 2.97 | 4.14 | 2.13 |
| 2006 | 1.96 | 2.35 | 1.7 |
| 2005 | 1.94 | 2.28 | 1.52 |
| 2004 | 1.66 | 1.85 | 1.5 |