| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.38 | 1.48 | 1.3 |
| 2024 | 2.44 | 4.19 | 1.15 |
| 2023 | 5.36 | 6.94 | 4.11 |
| 2022 | 6.49 | 9.96 | 5.01 |
| 2021 | 8.31 | 11.11 | 6.01 |
| 2020 | 7.54 | 9.8 | 5.85 |
| 2019 | 5.33 | 6.64 | 4.56 |
| 2018 | 8.36 | 13.61 | 4.43 |
| 2017 | 11.92 | 14.22 | 10.36 |
| 2016 | 11.7 | 13.31 | 9.94 |
| 2015 | 12.52 | 19.25 | 9.38 |
| 2014 | 8.19 | 12.54 | 6.05 |
| 2013 | 5.46 | 6.9 | 4.51 |
| 2012 | 4.74 | 5.56 | 3.88 |
| 2011 | 6.04 | 7.89 | 4.8 |
| 2010 | 5.7 | 8.08 | 3.92 |
| 2009 | 4.81 | 5.87 | 3.99 |
| 2008 | 6.69 | 12.72 | 3.4 |
| 2007 | 4.06 | 8.87 | 0.81 |
| 2006 | 0.75 | 0.88 | 0.48 |
| 2005 | 0.82 | 1.32 | 0.54 |
| 2004 | 1.76 | 3.24 | 1.09 |