| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.68 | 4.26 | 3.04 |
| 2024 | 3.75 | 4.67 | 2.96 |
| 2023 | 4.29 | 6.17 | 3.33 |
| 2022 | 3 | 4.01 | 2.25 |
| 2021 | 3.03 | 4.31 | 2.34 |
| 2020 | 2.27 | 2.81 | 1.81 |
| 2019 | 2.2 | 2.73 | 1.93 |
| 2018 | 2.7 | 3.64 | 2.03 |
| 2017 | 3.18 | 3.67 | 2.61 |
| 2016 | 3.31 | 3.9 | 3.02 |
| 2015 | 5.11 | 8.46 | 3.19 |
| 2014 | 4.11 | 4.56 | 3.62 |
| 2013 | 4.38 | 5.72 | 3.5 |
| 2012 | 3.89 | 5.07 | 3 |
| 2011 | 4.85 | 6.51 | 3.58 |
| 2010 | 6.47 | 7.99 | 5.06 |
| 2009 | 4.77 | 6.35 | 2.7 |
| 2008 | 3 | 4.53 | 1.85 |
| 2007 | 2.62 | 3.79 | 1.18 |
| 2006 | 1.34 | 1.88 | 1.11 |
| 2005 | 1.03 | 1.38 | 0.69 |
| 2004 | 1.38 | 2.07 | 1.09 |
| 2003 | 2.24 | 3.3 | 1.5 |
| 2002 | 3.01 | 3.27 | 2.77 |