| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.31 | 6.03 | 3.76 |
| 2024 | 4.09 | 6.37 | 3 |
| 2023 | 3.58 | 6.56 | 2.07 |
| 2022 | 2.6 | 3.34 | 2.07 |
| 2021 | 2.04 | 3.35 | 1.22 |
| 2020 | 2.07 | 3.18 | 1.31 |
| 2019 | 3.93 | 5.27 | 3.07 |
| 2018 | 4.23 | 7.53 | 2.9 |
| 2017 | 2.63 | 5.07 | 1.71 |
| 2016 | 1.35 | 1.81 | 0.67 |
| 2015 | 0.75 | 1.33 | 0.47 |
| 2014 | 0.34 | 0.53 | 0.23 |
| 2013 | 0.3 | 0.42 | 0.24 |
| 2012 | 0.36 | 0.46 | 0.29 |
| 2011 | 0.74 | 1.13 | 0.35 |
| 2010 | 1.27 | 2.17 | 0.9 |
| 2009 | 1.03 | 1.91 | 0.53 |
| 2008 | 1.89 | 4.91 | 0.4 |
| 2007 | 4.37 | 11.06 | 1.33 |
| 2006 | 1.12 | 1.46 | 0.85 |
| 2005 | 1.74 | 3.86 | 1.1 |
| 2004 | 2.28 | 4.12 | 1.23 |