| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.82 | 11.71 | 3.39 |
| 2024 | 3.22 | 4.62 | 2.18 |
| 2023 | 2.48 | 5.37 | 0.98 |
| 2022 | 1.01 | 1.61 | 0.7 |
| 2021 | 1.25 | 2.19 | 0.66 |
| 2020 | 2.61 | 3.41 | 1.94 |
| 2019 | 2.59 | 3.37 | 2.07 |
| 2018 | 2.4 | 3.18 | 1.79 |
| 2017 | 4.83 | 7.29 | 3.09 |
| 2016 | 5.13 | 7.06 | 3.23 |
| 2015 | 4.35 | 8.38 | 2.7 |
| 2014 | 2.22 | 3.18 | 1.71 |
| 2013 | 1.82 | 2.35 | 1.54 |
| 2012 | 1.72 | 2.1 | 1.42 |
| 2011 | 2.48 | 3.58 | 1.77 |
| 2010 | 4.07 | 6.17 | 2.66 |
| 2009 | 3.62 | 6.42 | 1.2 |
| 2008 | 1.74 | 3.25 | 0.88 |
| 2007 | 2.95 | 4.23 | 1.92 |
| 2006 | 1.39 | 2.01 | 1.04 |
| 2005 | 1.48 | 2.09 | 1.06 |
| 2004 | 2.05 | 3.18 | 1.07 |