| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.56 | 2.89 | 2.31 |
| 2024 | 2.89 | 3.38 | 2.09 |
| 2023 | 3.55 | 5.19 | 2.62 |
| 2022 | 4.46 | 5.9 | 3.14 |
| 2021 | 4.85 | 7.62 | 3.53 |
| 2020 | 7.18 | 11.18 | 3.86 |
| 2019 | 4.11 | 5.74 | 2.5 |
| 2018 | 5.46 | 7.78 | 2.78 |
| 2017 | 5.22 | 6.74 | 4.22 |
| 2016 | 6.25 | 7.14 | 4.93 |
| 2015 | 5.31 | 7.7 | 3.52 |
| 2014 | 3.29 | 4.01 | 2.55 |
| 2013 | 4.8 | 7.59 | 3.04 |
| 2012 | 4.27 | 5.15 | 2.94 |
| 2011 | 5.56 | 6.56 | 3.9 |
| 2010 | 6.5 | 8.39 | 4.42 |
| 2009 | 4.2 | 6.89 | 3.34 |
| 2008 | 4.79 | 7.3 | 2.71 |
| 2007 | 5.47 | 7.3 | 3.72 |
| 2006 | 3.22 | 3.91 | 2.64 |
| 2005 | 3.89 | 4.58 | 2.6 |
| 2004 | 3.9 | 4.56 | 2.1 |