| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.64 | 4.09 | 3.22 |
| 2024 | 3.1 | 4.18 | 2.38 |
| 2023 | 4.31 | 5.48 | 3.53 |
| 2022 | 4.76 | 7.03 | 3.42 |
| 2021 | 4.5 | 5.87 | 3.96 |
| 2020 | 4.8 | 6.39 | 3.38 |
| 2019 | 4.46 | 5.77 | 3.81 |
| 2018 | 4.69 | 6.74 | 3.44 |
| 2017 | 8.45 | 11.83 | 5.91 |
| 2016 | 9.59 | 11.44 | 6.35 |
| 2015 | 9.7 | 17.38 | 5.15 |
| 2014 | 3.76 | 5.89 | 1.91 |
| 2013 | 1.93 | 2.3 | 1.53 |
| 2012 | 2.19 | 2.7 | 1.61 |
| 2011 | 3.16 | 3.93 | 2.19 |
| 2010 | 3.51 | 4.61 | 2.44 |
| 2009 | 4.39 | 6.76 | 2.75 |
| 2008 | 4.02 | 7.12 | 2.04 |
| 2007 | 5.28 | 6.73 | 4.41 |