| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.56 | 3.93 | 3.17 |
| 2024 | 3.25 | 4.03 | 2.59 |
| 2023 | 4.29 | 4.96 | 3.62 |
| 2022 | 4.02 | 5.16 | 2.68 |
| 2021 | 3.5 | 5.08 | 2.75 |
| 2020 | 3.92 | 5.11 | 2.71 |
| 2019 | 5.09 | 10.52 | 3.13 |
| 2018 | 2.52 | 3.42 | 1.79 |
| 2017 | 4.46 | 6.41 | 3.21 |
| 2016 | 6.14 | 7.64 | 5.2 |
| 2015 | 7.71 | 14.57 | 4.77 |
| 2014 | 5.52 | 6.64 | 3.95 |
| 2013 | 3.97 | 5.79 | 3.04 |
| 2012 | 3.82 | 5.05 | 2.64 |
| 2011 | 5.56 | 7.59 | 3.88 |
| 2010 | 6.05 | 9.04 | 4.14 |
| 2009 | 3.75 | 7.61 | 2.13 |
| 2008 | 3.06 | 5.83 | 1.34 |
| 2007 | 3.45 | 4.76 | 2.04 |
| 2006 | 2.01 | 2.62 | 1.46 |
| 2005 | 2.14 | 2.72 | 1.43 |