| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 3.28 | 3.57 | 2.92 |
| 2025 | 4.47 | 6.32 | 3.18 |
| 2024 | 3.68 | 7.46 | 2.17 |
| 2023 | 4.71 | 8.23 | 1.86 |
| 2022 | 2.05 | 2.82 | 1.64 |
| 2021 | 1.93 | 2.51 | 1.58 |
| 2020 | 2.12 | 2.43 | 1.71 |
| 2019 | 2.86 | 3.78 | 2.16 |
| 2018 | 3.42 | 6.95 | 1.79 |
| 2017 | 5.95 | 12.79 | 4.08 |
| 2016 | 5.83 | 10.49 | 3.91 |
| 2015 | 20.43 | 56.68 | 6.69 |
| 2014 | 5.35 | 9.56 | 3.9 |
| 2013 | 7.44 | 14.85 | 4.2 |
| 2012 | 7.62 | 15.42 | 3.7 |
| 2011 | 5.21 | 7.21 | 3.53 |
| 2010 | 8.38 | 12.15 | 5.66 |
| 2009 | 8.08 | 14.96 | 2.81 |
| 2008 | 25.63 | 136.46 | 1.57 |
| 2007 | 18.87 | 42.11 | 4.85 |
| 2006 | 4.3 | 5.13 | 3.23 |
| 2005 | 4.91 | 6.01 | 3.67 |