| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.87 | 4.38 | 3.47 |
| 2024 | 5.21 | 7.14 | 3.27 |
| 2023 | 8.31 | 11.11 | 5.86 |
| 2022 | 8.71 | 10.22 | 7.04 |
| 2021 | 10.76 | 14.3 | 8.56 |
| 2020 | 9.31 | 13.64 | 4.95 |
| 2019 | 5.5 | 6.95 | 3.05 |
| 2018 | 4.83 | 6.84 | 3.22 |
| 2017 | 4.35 | 5.46 | 3.64 |
| 2016 | 3.81 | 4.78 | 2.59 |
| 2015 | 3.6 | 5 | 2.66 |
| 2014 | 2.56 | 3.98 | 1.93 |
| 2013 | 2.84 | 4.41 | 1.94 |
| 2012 | 5.82 | 8.88 | 2.88 |
| 2011 | 9.19 | 12.19 | 7.02 |
| 2010 | 8.27 | 13.21 | 5.69 |
| 2009 | 3.19 | 5.98 | 1.48 |
| 2008 | 2.65 | 5.65 | 1.08 |
| 2007 | 3.7 | 7.08 | 2.04 |
| 2006 | 1.9 | 2.93 | 1.5 |
| 2005 | 1.01 | 1.56 | 0.62 |
| 2004 | 1.57 | 2.92 | 0.97 |