| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.65 | 4.89 | 4.32 |
| 2024 | 5.1 | 6.34 | 4.2 |
| 2023 | 4.62 | 7.12 | 1.65 |
| 2022 | 1.91 | 2.47 | 1 |
| 2021 | 0.85 | 2.79 | 0.4 |
| 2020 | 0.54 | 0.66 | 0.46 |
| 2019 | 0.49 | 0.6 | 0.39 |
| 2018 | 1.61 | 6.29 | 0.4 |
| 2017 | 2.22 | 5.85 | 0.88 |
| 2016 | 2.66 | 4.11 | 1.99 |
| 2015 | 4.02 | 7.24 | 2.34 |
| 2014 | 2.28 | 3.41 | 1.42 |
| 2013 | 2.12 | 3.01 | 1.59 |
| 2012 | 2.01 | 4.1 | 1.24 |
| 2011 | 3.64 | 5.26 | 1.83 |
| 2010 | 4.23 | 8.71 | 2.04 |
| 2009 | 2.39 | 5.13 | 1.04 |
| 2008 | 3.06 | 6.71 | 0.8 |
| 2007 | 6.19 | 11.46 | 3.31 |
| 2006 | 3.52 | 7.8 | 1.49 |
| 2005 | 4.35 | 10.56 | 1.4 |
| 2004 | 15.03 | 23.4 | 8.1 |