| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.61 | 2.09 | 1.19 |
| 2024 | 1.17 | 1.41 | 0.94 |
| 2023 | 1.42 | 1.74 | 1.19 |
| 2022 | 1.71 | 2.24 | 1.32 |
| 2021 | 3.33 | 5.58 | 1.96 |
| 2020 | 2.97 | 4.52 | 1.88 |
| 2019 | 1.5 | 2.14 | 1.21 |
| 2018 | 1.43 | 1.85 | 0.98 |
| 2017 | 1.9 | 2.46 | 1.51 |
| 2016 | 2.01 | 2.45 | 1.7 |
| 2015 | 2.86 | 5.36 | 2.03 |
| 2014 | 1.68 | 2.28 | 1.39 |
| 2013 | 1.91 | 2.36 | 1.43 |
| 2012 | 2.72 | 5.16 | 1.44 |
| 2011 | 6.09 | 8.13 | 4.06 |
| 2010 | 5.14 | 7.5 | 3.44 |
| 2009 | 4.31 | 6.22 | 2.23 |
| 2008 | 5.34 | 11.25 | 1.72 |
| 2007 | 15.46 | 24.13 | 8.16 |
| 2006 | 5.47 | 11.13 | 2.78 |
| 2005 | 2.89 | 3.44 | 2.32 |