| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.28 | 6.12 | 4.37 |
| 2024 | 3.99 | 8.6 | 1.83 |
| 2023 | 2.16 | 3.85 | 1.58 |
| 2022 | 2.64 | 4.24 | 2.08 |
| 2021 | 2.31 | 3.51 | 1.95 |
| 2020 | 2.45 | 3.15 | 1.83 |
| 2019 | 2.45 | 3.46 | 1.64 |
| 2018 | 2.26 | 4.54 | 0.86 |
| 2017 | 4.73 | 6.43 | 3.12 |
| 2016 | 8.65 | 14 | 5.92 |
| 2015 | 12.29 | 25.35 | 5.01 |
| 2014 | 5.27 | 7.89 | 3.18 |
| 2013 | 4.37 | 4.99 | 3.54 |
| 2012 | 5.65 | 9.59 | 3.11 |
| 2011 | 5.21 | 7.4 | 3.03 |
| 2010 | 11.91 | 30.73 | 6.13 |
| 2009 | 7.87 | 20.01 | 1.92 |
| 2008 | 4.29 | 7.46 | 1.45 |
| 2007 | 15.95 | 60.72 | 5.08 |
| 2006 | 13.64 | 19.84 | 8.92 |
| 2005 | 9.24 | 14.65 | 5.47 |
| 2004 | 9.56 | 16.78 | 6.54 |