| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.32 | 5.25 | 3.63 |
| 2024 | 4.09 | 6.19 | 2.75 |
| 2023 | 6.09 | 8.16 | 4.1 |
| 2022 | 5.26 | 8.52 | 3.07 |
| 2021 | 3.14 | 4.32 | 2.41 |
| 2020 | 2.76 | 3.42 | 2.12 |
| 2019 | 2.63 | 3.49 | 2.11 |
| 2018 | 2.73 | 3.74 | 1.93 |
| 2017 | 4.51 | 6.88 | 3.06 |
| 2016 | 5.4 | 7.88 | 4.1 |
| 2015 | 7.7 | 15.28 | 4.51 |
| 2014 | 4.56 | 5.73 | 3.63 |
| 2013 | 4.31 | 6.21 | 3.22 |
| 2012 | 4.75 | 5.68 | 3.63 |
| 2011 | 6.45 | 9.53 | 4.43 |
| 2010 | 4.68 | 6.05 | 3.53 |
| 2009 | 3.24 | 5.19 | 1.81 |
| 2008 | 2.75 | 5.18 | 1.41 |
| 2007 | 3.82 | 5.29 | 2.3 |
| 2006 | 2.35 | 2.94 | 1.84 |
| 2005 | 1.86 | 2.29 | 1.32 |
| 2004 | 3.12 | 5.81 | 1.89 |