| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.57 | 2.68 | 2.37 |
| 2024 | 2.51 | 3.19 | 2.07 |
| 2023 | 2.76 | 3.19 | 2.32 |
| 2022 | 3.31 | 4.94 | 2.6 |
| 2021 | 4.75 | 6.29 | 4.05 |
| 2020 | 6.28 | 9.72 | 1.64 |
| 2019 | 1.75 | 3.46 | 0.92 |
| 2018 | 1.07 | 1.39 | 0.84 |
| 2017 | 1.57 | 1.85 | 1.31 |
| 2016 | 2.13 | 3.22 | 1.69 |
| 2015 | 3.84 | 6.27 | 2.42 |
| 2014 | 4.16 | 5.64 | 3.23 |
| 2013 | 5.31 | 8.25 | 3.31 |
| 2012 | 6.75 | 7.94 | 5.58 |
| 2011 | 5.94 | 7.85 | 4.46 |
| 2010 | 8.12 | 9.26 | 6.6 |
| 2009 | 6.68 | 8.82 | 5.05 |
| 2008 | 6.95 | 10.72 | 3.03 |
| 2007 | 7.84 | 11.86 | 4.91 |
| 2006 | 4.85 | 8.23 | 2.51 |
| 2005 | 3.14 | 4.38 | 1.79 |
| 2004 | 4.6 | 8.12 | 2.39 |