| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.1 | 3.29 | 2.89 |
| 2024 | 3.39 | 4.2 | 2.71 |
| 2023 | 5.51 | 8.38 | 3.86 |
| 2022 | 5.42 | 6.55 | 4.32 |
| 2021 | 5.9 | 8.55 | 4.6 |
| 2020 | 3.23 | 7.73 | 1.87 |
| 2019 | 2.93 | 4.27 | 2.47 |
| 2018 | 4.35 | 5.99 | 2.54 |
| 2017 | 4.26 | 6.96 | 3.93 |
| 2016 | 4.02 | 5.21 | 3.16 |
| 2015 | 3.71 | 6.03 | 2.8 |
| 2014 | 2.05 | 3.86 | 1.58 |
| 2013 | 2.47 | 3.87 | 1.76 |
| 2012 | 2.84 | 3.71 | 1.99 |
| 2011 | 3.44 | 4.69 | 2.13 |
| 2010 | 4.76 | 6.55 | 3.5 |
| 2009 | 3.45 | 5.95 | 1.77 |
| 2008 | 3.54 | 7.61 | 1.03 |
| 2007 | 3.66 | 6.88 | 1.45 |
| 2006 | 1.77 | 2.49 | 1.24 |
| 2005 | 1.61 | 2.08 | 1.25 |
| 2004 | 2.11 | 2.87 | 1.45 |