| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.48 | 4.99 | 3.8 |
| 2024 | 3.9 | 5.94 | 2.47 |
| 2023 | 5.18 | 6.42 | 3.86 |
| 2022 | 3.58 | 4.56 | 2.78 |
| 2021 | 3.01 | 3.97 | 2.53 |
| 2020 | 4.29 | 5.46 | 2.97 |
| 2019 | 5.6 | 7.39 | 4.18 |
| 2018 | 5.76 | 7.88 | 3.59 |
| 2017 | 8.49 | 9.47 | 6.95 |
| 2016 | 8.79 | 10.67 | 6.32 |
| 2015 | 7.05 | 8.18 | 4.48 |
| 2014 | 3.75 | 4.72 | 2.56 |
| 2013 | 2.62 | 3.43 | 2.08 |
| 2012 | 2.24 | 3.19 | 1.72 |
| 2011 | 3.52 | 5.31 | 2.04 |
| 2010 | 3.76 | 5.06 | 2.78 |
| 2009 | 3.21 | 4.99 | 1.69 |
| 2008 | 2.52 | 5.37 | 0.89 |
| 2007 | 2.42 | 5.13 | 0.84 |
| 2006 | 0.92 | 1.21 | 0.66 |
| 2005 | 0.99 | 1.47 | 0.62 |
| 2004 | 1.58 | 2.87 | 0.92 |