| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.61 | 9.94 | 4.14 |
| 2024 | 3.04 | 7.53 | 1.93 |
| 2023 | 3.22 | 4.14 | 2.52 |
| 2022 | 2.37 | 4.37 | 1.31 |
| 2021 | 1.41 | 1.75 | 1.14 |
| 2020 | 1.43 | 1.8 | 1.18 |
| 2019 | 1.55 | 2.15 | 1.3 |
| 2018 | 1.7 | 2.21 | 1.31 |
| 2017 | 2.36 | 2.94 | 1.98 |
| 2016 | 3.12 | 4.44 | 2.55 |
| 2015 | 3.73 | 5.55 | 2.03 |
| 2014 | 2.64 | 5.64 | 1.85 |
| 2013 | 2.09 | 2.49 | 1.82 |
| 2012 | 2.04 | 2.73 | 1.6 |
| 2011 | 2.97 | 3.76 | 2.04 |
| 2010 | 3.18 | 4.08 | 2.23 |
| 2009 | 3.05 | 4.71 | 1.64 |
| 2008 | 2.89 | 6.61 | 1.08 |
| 2007 | 5.08 | 6.81 | 3.81 |
| 2006 | 2.97 | 4.08 | 2.09 |
| 2005 | 3.15 | 3.88 | 2.35 |