| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.44 | 3.01 | 1.9 |
| 2023 | 2.65 | 3.67 | 2 |
| 2022 | 4.18 | 5.44 | 3.13 |
| 2021 | 4.76 | 6.69 | 3.7 |
| 2020 | 4.31 | 6.72 | 3.01 |
| 2019 | 4.86 | 6.27 | 3.54 |
| 2018 | 4.82 | 6.06 | 3.55 |
| 2017 | 5.73 | 8.18 | 3.93 |
| 2016 | 6.21 | 7.98 | 5.11 |
| 2015 | 9.31 | 12.28 | 6.46 |
| 2014 | 9.64 | 13.98 | 6.21 |
| 2013 | 14.01 | 17.15 | 10.92 |
| 2012 | 12.34 | 14.87 | 9.83 |
| 2011 | 14.15 | 17.45 | 12.21 |