| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.9 | 10.5 | 5.32 |
| 2024 | 6.41 | 11.29 | 3.57 |
| 2023 | 4.45 | 6.89 | 2.36 |
| 2022 | 2.25 | 2.97 | 1.81 |
| 2021 | 1.53 | 1.98 | 1.32 |
| 2020 | 1.94 | 2.73 | 1.55 |
| 2019 | 2.08 | 3.17 | 1.72 |
| 2018 | 1.79 | 2.73 | 1.21 |
| 2017 | 5.38 | 8.26 | 2.13 |
| 2016 | 6.9 | 11.09 | 5.28 |
| 2015 | 5.18 | 9.66 | 2.79 |
| 2014 | 2.5 | 3.68 | 1.94 |
| 2013 | 2.16 | 2.7 | 1.7 |
| 2012 | 1.84 | 2.33 | 1.52 |
| 2011 | 2.07 | 2.43 | 1.67 |
| 2010 | 2.42 | 3.29 | 1.88 |
| 2009 | 2.43 | 3.2 | 1.21 |
| 2008 | 2.23 | 4.37 | 0.96 |
| 2007 | 4.15 | 6.01 | 3.05 |
| 2006 | 2.74 | 4 | 1.93 |
| 2005 | 2.98 | 4.04 | 2.11 |