| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.04 | 3.17 | 2.88 |
| 2024 | 3.68 | 4.75 | 2.9 |
| 2023 | 6.59 | 8.78 | 4.27 |
| 2022 | 6.11 | 7.39 | 5.09 |
| 2021 | 5.15 | 5.92 | 3.91 |
| 2020 | 4.54 | 6.41 | 3.31 |
| 2019 | 4.34 | 6.17 | 2.59 |
| 2018 | 4.13 | 5.63 | 2.64 |
| 2017 | 3.82 | 4.9 | 2.69 |
| 2016 | 2.63 | 2.95 | 2.3 |
| 2015 | 2.84 | 4.28 | 2.18 |
| 2014 | 1.71 | 2.69 | 1.49 |
| 2013 | 1.66 | 1.94 | 1.45 |
| 2012 | 1.76 | 1.96 | 1.59 |
| 2011 | 2.29 | 2.88 | 1.66 |
| 2010 | 3.44 | 4.47 | 2.58 |
| 2009 | 3.47 | 4.09 | 2.8 |
| 2008 | 5.42 | 10.26 | 2.64 |
| 2007 | 6.56 | 9.24 | 3.21 |
| 2006 | 3.02 | 3.56 | 2.61 |
| 2005 | 4.23 | 5.31 | 3.24 |
| 2004 | 5.45 | 8.82 | 3.9 |