| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.13 | 9.85 | 5.22 |
| 2024 | 5.35 | 7.15 | 4.07 |
| 2023 | 6.56 | 7.98 | 5.62 |
| 2022 | 5.72 | 7.07 | 4.5 |
| 2021 | 5.88 | 7.52 | 5.05 |
| 2020 | 5.89 | 9.03 | 5.08 |
| 2019 | 6.28 | 7.99 | 5.31 |
| 2018 | 6.55 | 9.14 | 4.92 |
| 2017 | 10.66 | 13.65 | 8.87 |
| 2016 | 9.75 | 13.07 | 6.98 |
| 2015 | 13.11 | 23.14 | 8.31 |
| 2014 | 6.55 | 11.14 | 3.93 |
| 2013 | 4.54 | 5.85 | 2.81 |
| 2012 | 2.94 | 3.83 | 2.28 |
| 2011 | 4.14 | 5.88 | 2.54 |
| 2010 | 5.5 | 7.06 | 4.23 |
| 2009 | 8.06 | 11.54 | 4.89 |
| 2008 | 5.2 | 8.61 | 3.26 |
| 2007 | 3.61 | 5.12 | 1.6 |
| 2006 | 1.43 | 2.19 | 0.96 |
| 2005 | 0.94 | 1.17 | 0.72 |
| 2004 | 1.44 | 2.03 | 1.13 |