| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 7.3 | 9.19 | 5.45 |
| 2023 | 6.34 | 7.9 | 4.85 |
| 2022 | 5.39 | 7.22 | 4.32 |
| 2021 | 7.64 | 10.57 | 5.38 |
| 2020 | 9.5 | 11.24 | 8.12 |
| 2019 | 9.36 | 11.57 | 7.41 |
| 2018 | 7.49 | 8.82 | 6.3 |
| 2017 | 6.24 | 7.35 | 4.95 |
| 2016 | 4.9 | 6.24 | 3.7 |
| 2015 | 3.79 | 5.08 | 3.03 |
| 2014 | 2.72 | 3.18 | 2.25 |
| 2013 | 2.6 | 3.17 | 2.17 |
| 2012 | 2.81 | 3.83 | 2 |
| 2011 | 5.02 | 6.57 | 3.58 |
| 2010 | 5.01 | 6.4 | 3.9 |
| 2009 | 3.68 | 4.93 | 2.92 |
| 2008 | 4.42 | 7.97 | 2.32 |
| 2007 | 7.46 | 11.46 | 4.41 |
| 2006 | 3.06 | 4.65 | 1.66 |
| 2005 | 2.02 | 2.43 | 1.63 |