| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.55 | 9.25 | 6.63 |
| 2024 | 6.05 | 8.3 | 4.58 |
| 2023 | 5.57 | 7.13 | 4.35 |
| 2022 | 5.15 | 6.94 | 3.82 |
| 2021 | 4.68 | 6.95 | 3.5 |
| 2020 | 2.5 | 3.79 | 1.69 |
| 2019 | 3.16 | 4.25 | 1.99 |
| 2018 | 3.51 | 4.7 | 2.5 |
| 2017 | 6.53 | 9.7 | 4.28 |
| 2016 | 9.65 | 13.71 | 8.1 |
| 2015 | 12.25 | 19.93 | 7.99 |
| 2014 | 5.69 | 9.89 | 3.18 |
| 2013 | 2.97 | 4.18 | 1.88 |
| 2012 | 2.22 | 2.98 | 1.64 |
| 2011 | 6.51 | 12.25 | 2.4 |
| 2010 | 8.57 | 15.7 | 5.14 |
| 2009 | 5.19 | 7.43 | 3.24 |
| 2008 | 5.72 | 11.28 | 2.01 |
| 2007 | 9.72 | 13.61 | 6.13 |
| 2006 | 6.49 | 9.53 | 4.47 |
| 2005 | 4.19 | 5.17 | 3.17 |
| 2004 | 9.14 | 16.04 | 4.4 |