| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.31 | 4.02 | 2.75 |
| 2024 | 2.52 | 5.27 | 1.73 |
| 2023 | 2.27 | 3.09 | 1.79 |
| 2022 | 2 | 2.34 | 1.75 |
| 2021 | 2.33 | 3.08 | 1.98 |
| 2020 | 2.21 | 2.9 | 1.63 |
| 2019 | 2 | 2.32 | 1.56 |
| 2018 | 2.5 | 3.88 | 1.46 |
| 2017 | 3.71 | 4.59 | 3.31 |
| 2016 | 3.1 | 4.54 | 2.2 |
| 2015 | 3.17 | 5.97 | 2.15 |
| 2014 | 1.98 | 2.53 | 1.71 |
| 2013 | 1.74 | 2.2 | 1.31 |
| 2012 | 2.19 | 2.86 | 1.44 |
| 2011 | 3.93 | 5.61 | 2.32 |
| 2010 | 4.74 | 6.06 | 3.6 |
| 2009 | 3.95 | 5.12 | 2.72 |
| 2008 | 5.32 | 9.6 | 2.18 |
| 2007 | 6.66 | 9.15 | 2.76 |
| 2006 | 1.78 | 2.9 | 1.28 |
| 2005 | 1.6 | 2.06 | 1.12 |
| 2004 | 1.82 | 3.08 | 1.28 |