| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.45 | 1.68 | 1.27 |
| 2024 | 1.43 | 2.16 | 1.09 |
| 2023 | 1.5 | 2.07 | 1.07 |
| 2022 | 1.18 | 1.49 | 1.02 |
| 2021 | 1.25 | 1.47 | 1.07 |
| 2020 | 1.51 | 1.98 | 1.2 |
| 2019 | 1.61 | 2.43 | 1.32 |
| 2018 | 2.07 | 2.86 | 1.3 |
| 2017 | 4.08 | 6.46 | 2.53 |
| 2016 | 5.39 | 7.03 | 3.47 |
| 2015 | 4.7 | 9.23 | 2.51 |
| 2014 | 2.22 | 3.31 | 1.45 |
| 2013 | 1.41 | 1.61 | 1.18 |
| 2012 | 1.47 | 2 | 1.12 |
| 2011 | 2.08 | 2.56 | 1.4 |
| 2010 | 2.03 | 2.47 | 1.67 |
| 2009 | 1.45 | 2.36 | 0.8 |
| 2008 | 1.4 | 2.75 | 0.62 |
| 2007 | 2.19 | 3.42 | 1.28 |
| 2006 | 1.32 | 1.59 | 1.18 |
| 2005 | 1.73 | 2.3 | 1.5 |