| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.95 | 7.46 | 6.72 |
| 2024 | 8.74 | 11.96 | 6.12 |
| 2023 | 15.32 | 22.46 | 10.88 |
| 2022 | 16.11 | 20.8 | 11.63 |
| 2021 | 12.04 | 24.43 | 6.66 |
| 2020 | 5.99 | 7.64 | 4.01 |
| 2019 | 6.05 | 8.31 | 4.75 |
| 2018 | 12.34 | 17.56 | 7.01 |
| 2017 | 14.28 | 18.61 | 12.37 |
| 2016 | 16.15 | 24.05 | 11.78 |
| 2015 | 23.91 | 39.92 | 14.39 |
| 2014 | 20.68 | 26.1 | 16.56 |
| 2013 | 19.45 | 30.38 | 7.92 |
| 2012 | 8.04 | 9.2 | 5.7 |
| 2011 | 9.78 | 13.38 | 6.08 |
| 2010 | 7.54 | 11.9 | 5.11 |
| 2009 | 4.86 | 9.1 | 1.34 |
| 2008 | 3.6 | 10.51 | 1.01 |
| 2007 | 6.29 | 11.84 | 2.6 |
| 2006 | 2.69 | 3.88 | 1.58 |
| 2005 | 1.47 | 1.96 | 0.85 |
| 2004 | 1.63 | 2.76 | 1.17 |