| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.46 | 4.93 | 4.02 |
| 2024 | 3.41 | 5.03 | 2.38 |
| 2023 | 3.47 | 3.82 | 2.92 |
| 2022 | 3.35 | 4.29 | 2.32 |
| 2021 | 3.08 | 4.23 | 2.71 |
| 2020 | 2.7 | 3.73 | 2.14 |
| 2019 | 2.83 | 3.63 | 2.24 |
| 2018 | 2.93 | 3.96 | 2.11 |
| 2017 | 5.3 | 7.02 | 3.74 |
| 2016 | 6.54 | 8.26 | 4.93 |
| 2015 | 7.42 | 12.08 | 4.78 |
| 2014 | 3.55 | 6.13 | 1.97 |
| 2013 | 2.2 | 3.75 | 1.57 |
| 2012 | 2.51 | 3.22 | 1.81 |
| 2011 | 4.24 | 6.08 | 2.41 |
| 2010 | 7.5 | 13.41 | 4.98 |
| 2009 | 4.97 | 7.19 | 3.16 |
| 2008 | 4.75 | 9.24 | 1.82 |
| 2007 | 6.88 | 9.47 | 3.4 |
| 2006 | 3.04 | 4.56 | 1.8 |
| 2005 | 1.74 | 2.47 | 1.25 |
| 2004 | 3.01 | 4.26 | 2.1 |