| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.43 | 6.53 | 4.73 |
| 2024 | 3.73 | 8.25 | 3.02 |
| 2023 | 3.98 | 4.67 | 3.44 |
| 2022 | 4.08 | 5.34 | 3.49 |
| 2021 | 3.48 | 3.95 | 2.94 |
| 2020 | 2.93 | 3.84 | 2.06 |
| 2019 | 2.63 | 3.13 | 2.23 |
| 2018 | 2.26 | 3.04 | 1.83 |
| 2017 | 2.5 | 3.23 | 2.13 |
| 2016 | 2.35 | 3.15 | 1.8 |
| 2015 | 2.69 | 4.6 | 1.81 |
| 2014 | 1.77 | 2.06 | 1.48 |
| 2013 | 1.37 | 1.92 | 1.15 |
| 2012 | 1.56 | 2.01 | 1.13 |
| 2011 | 2.37 | 3.03 | 1.65 |
| 2010 | 3.93 | 5.73 | 2.76 |
| 2009 | 3.85 | 4.85 | 2.66 |
| 2008 | 4.63 | 8.72 | 2.31 |
| 2007 | 7.15 | 11.43 | 3.44 |
| 2006 | 3.11 | 3.73 | 2.59 |
| 2005 | 2.8 | 3.75 | 1.21 |
| 2004 | 2.08 | 3.55 | 1.4 |