| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.79 | 4.32 | 3.28 |
| 2024 | 3.26 | 4.69 | 2.35 |
| 2023 | 3.59 | 4.28 | 3.23 |
| 2022 | 3.5 | 5.01 | 2.7 |
| 2021 | 2.71 | 3.23 | 2.46 |
| 2020 | 3.41 | 5.08 | 2.88 |
| 2019 | 3.44 | 4.27 | 2.86 |
| 2018 | 3.71 | 5.17 | 2.89 |
| 2017 | 6.63 | 9.37 | 4.61 |
| 2016 | 6.61 | 8.1 | 4.5 |
| 2015 | 5.56 | 8.8 | 3.52 |
| 2014 | 3.52 | 4.78 | 2.5 |
| 2013 | 2.87 | 3.29 | 2.47 |
| 2012 | 3.1 | 3.63 | 2.65 |
| 2011 | 3.8 | 4.63 | 2.92 |
| 2010 | 3.78 | 4.7 | 2.88 |
| 2009 | 3.48 | 4.48 | 1.93 |
| 2008 | 2.68 | 4.74 | 1.26 |
| 2007 | 3.94 | 5.52 | 1.88 |
| 2006 | 2.4 | 3.56 | 1.66 |
| 2005 | 1.93 | 2.34 | 1.55 |
| 2004 | 2.41 | 3.32 | 1.86 |
| 2003 | 3.19 | 4.03 | 2.17 |
| 2002 | 4.62 | 5.39 | 3.67 |
| 2001 | 6.82 | 8.57 | 4.9 |