| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.45 | 2.7 | 2.19 |
| 2024 | 2.49 | 3.21 | 1.89 |
| 2023 | 2.67 | 3.97 | 1.98 |
| 2022 | 2.42 | 3.78 | 1.85 |
| 2021 | 2.24 | 4.2 | 1.78 |
| 2020 | 2.15 | 2.47 | 1.83 |
| 2019 | 2.56 | 3.13 | 2.05 |
| 2018 | 2.83 | 3.62 | 2.04 |
| 2017 | 3.89 | 4.8 | 3.01 |
| 2016 | 4.24 | 5.89 | 3.23 |
| 2015 | 5.46 | 9.37 | 3.37 |
| 2014 | 3.46 | 4.77 | 2.5 |
| 2013 | 3.83 | 4.91 | 3.17 |
| 2012 | 3.41 | 4.38 | 2.28 |
| 2011 | 4.46 | 6.29 | 2.45 |
| 2010 | 6.78 | 11.06 | 3.97 |
| 2009 | 9.89 | 12.05 | 5.65 |
| 2008 | 6.25 | 8.66 | 3.66 |
| 2007 | 3.24 | 6.09 | 1.58 |
| 2006 | 1.5 | 1.83 | 1.12 |
| 2005 | 1.46 | 1.88 | 1.15 |