| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.33 | 6.94 | 5.88 |
| 2024 | 5.13 | 7.31 | 3.28 |
| 2023 | 5.37 | 7.35 | 4 |
| 2022 | 8.58 | 13.08 | 5.27 |
| 2021 | 9.44 | 15.54 | 5.22 |
| 2020 | 3 | 5.09 | 1.83 |
| 2019 | 1.41 | 2.19 | 0.8 |
| 2018 | 1.18 | 1.92 | 0.62 |
| 2017 | 1.65 | 1.87 | 1.54 |
| 2016 | 12.92 | 16.45 | 9.36 |
| 2015 | 7.93 | 17.27 | 2.4 |
| 2014 | 1.51 | 2.95 | 0.73 |
| 2013 | 0.98 | 1.29 | 0.74 |
| 2012 | 1.09 | 1.26 | 0.9 |
| 2011 | 1.45 | 1.95 | 0.93 |
| 2010 | 1.62 | 1.99 | 1.25 |
| 2009 | 1.51 | 1.9 | 1.05 |
| 2008 | 2.46 | 4.54 | 0.74 |
| 2007 | 2.95 | 5.05 | 1.36 |
| 2006 | 1.4 | 1.77 | 1.08 |
| 2005 | 1.6 | 2.38 | 1.08 |
| 2004 | 1.71 | 3.12 | 0.99 |