| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.3 | 4.24 | 2.61 |
| 2024 | 2.73 | 4.3 | 1.8 |
| 2023 | 3.08 | 5.26 | 2.46 |
| 2022 | 3.09 | 4.89 | 2.12 |
| 2021 | 2.84 | 4.21 | 2.2 |
| 2020 | 3.38 | 4 | 2.78 |
| 2019 | 3.41 | 4.52 | 2.1 |
| 2018 | 2.74 | 4.02 | 1.96 |
| 2017 | 5 | 8.02 | 3.28 |
| 2016 | 8.87 | 11.38 | 7.1 |
| 2015 | 13.35 | 34.72 | 4.28 |
| 2014 | 3.99 | 5.48 | 3.11 |
| 2013 | 3.37 | 4.25 | 2.55 |
| 2012 | 2.44 | 2.97 | 2.06 |
| 2011 | 3.22 | 4.33 | 2.35 |
| 2010 | 3.76 | 4.63 | 2.95 |
| 2009 | 2.27 | 3.3 | 1.37 |
| 2008 | 2.64 | 5.23 | 0.99 |
| 2007 | 3.69 | 5.46 | 1.62 |
| 2006 | 1.97 | 2.63 | 1.55 |
| 2005 | 2.07 | 2.51 | 1.39 |
| 2004 | 2.98 | 5.35 | 2.07 |