| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.44 | 1.51 | 1.4 |
| 2024 | 1.5 | 1.73 | 1.27 |
| 2023 | 2.39 | 4.34 | 1.36 |
| 2022 | 5.09 | 19.63 | 2.47 |
| 2021 | 2 | 4.52 | 1.27 |
| 2020 | 1.69 | 2.04 | 1.47 |
| 2019 | 1.75 | 2.34 | 1.57 |
| 2018 | 2 | 2.56 | 1.55 |
| 2017 | 3.17 | 4.47 | 2.39 |
| 2016 | 3.16 | 4.33 | 2.52 |
| 2015 | 3.19 | 5.45 | 2.35 |
| 2014 | 1.98 | 2.75 | 1.57 |
| 2013 | 1.99 | 2.39 | 1.74 |
| 2012 | 2.71 | 3.56 | 1.86 |
| 2011 | 4.93 | 7.07 | 2.8 |
| 2010 | 4.44 | 6.4 | 3.46 |
| 2009 | 4.37 | 5.46 | 3.4 |
| 2008 | 6.25 | 10.41 | 3.09 |
| 2007 | 5.23 | 9.88 | 2.76 |
| 2006 | 2.67 | 3.32 | 2.1 |
| 2005 | 2.1 | 2.49 | 1.14 |