| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.63 | 1.92 | 1.46 |
| 2024 | 1.72 | 2.07 | 1.29 |
| 2023 | 1.94 | 2.27 | 1.66 |
| 2022 | 1.92 | 2.99 | 1.41 |
| 2021 | 2.58 | 3.29 | 1.9 |
| 2020 | 3.6 | 5.17 | 2.59 |
| 2019 | 2.27 | 3.04 | 1.64 |
| 2018 | 3.04 | 4.58 | 1.68 |
| 2017 | 5.28 | 7.47 | 3.95 |
| 2016 | 5.97 | 8.48 | 4.71 |
| 2015 | 5.26 | 8.31 | 3.77 |
| 2014 | 10.67 | 26 | 3.99 |
| 2013 | 5.14 | 9.28 | 2.79 |
| 2012 | 3.06 | 4.07 | 2.14 |
| 2011 | 4.71 | 7.11 | 2.39 |
| 2010 | 4.23 | 6.11 | 2.72 |
| 2009 | 3.8 | 5.67 | 2.72 |
| 2008 | 6.31 | 19.63 | 1.53 |
| 2007 | 12.81 | 23.06 | 2.04 |
| 2006 | 1.89 | 2.27 | 1.44 |
| 2005 | 3.05 | 4.34 | 1.95 |