| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.53 | 2.74 | 2.26 |
| 2024 | 2.54 | 3.45 | 2.01 |
| 2023 | 3.33 | 4.14 | 2.88 |
| 2022 | 3.81 | 6.85 | 2.82 |
| 2021 | 3.14 | 8.38 | 2.14 |
| 2020 | 2.64 | 3.56 | 2.19 |
| 2019 | 3.09 | 4.33 | 2.32 |
| 2018 | 3.68 | 4.75 | 2.49 |
| 2017 | 4.7 | 8.02 | 3.36 |
| 2016 | 7.65 | 10.07 | 6.1 |
| 2015 | 12.4 | 17.9 | 4.82 |
| 2014 | 4.2 | 5.86 | 2.74 |
| 2013 | 3.01 | 3.7 | 2.55 |
| 2012 | 3.52 | 4.29 | 2.9 |
| 2011 | 5.15 | 7.03 | 3.38 |
| 2010 | 4.59 | 5.98 | 3.46 |
| 2009 | 3.74 | 5.13 | 2.71 |
| 2008 | 4.7 | 8.67 | 2.2 |
| 2007 | 7.4 | 11.4 | 3.56 |
| 2006 | 3.8 | 5.64 | 2.89 |
| 2005 | 2.57 | 3.11 | 1.61 |
| 2004 | 3.77 | 6.43 | 2.34 |