| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.58 | 8.33 | 4.14 |
| 2024 | 3.86 | 5.18 | 3.12 |
| 2023 | 4.66 | 5.46 | 3.86 |
| 2022 | 6.1 | 8.92 | 4.7 |
| 2021 | 8.99 | 11.82 | 6.36 |
| 2020 | 4.69 | 7.27 | 3.01 |
| 2019 | 3.27 | 4.35 | 2.24 |
| 2018 | 4.65 | 10.65 | 2.41 |
| 2017 | 10.63 | 23.36 | 6.21 |
| 2016 | 7.33 | 9.06 | 5.24 |
| 2015 | 6.47 | 9.51 | 4.06 |
| 2014 | 4.54 | 6.14 | 3.06 |
| 2013 | 3.58 | 4.06 | 2.81 |
| 2012 | 2.83 | 3.55 | 2.27 |
| 2011 | 5.13 | 7.52 | 2.57 |
| 2010 | 4.45 | 6.31 | 3.47 |
| 2009 | 3.48 | 5.4 | 2.09 |
| 2008 | 3.62 | 6.18 | 1.29 |
| 2007 | 4.89 | 6.71 | 1.16 |
| 2006 | 1.48 | 2.41 | 0.94 |
| 2005 | 1.16 | 1.56 | 0.89 |
| 2004 | 1.66 | 2.53 | 1.15 |