| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.72 | 2.97 | 2.44 |
| 2024 | 2.24 | 3.2 | 1.67 |
| 2023 | 2.49 | 3.29 | 1.87 |
| 2022 | 3.8 | 6 | 2.6 |
| 2021 | 4.72 | 8.41 | 2.5 |
| 2020 | 2.09 | 2.84 | 1.64 |
| 2019 | 2.73 | 3.49 | 1.84 |
| 2018 | 4.04 | 6.43 | 2.56 |
| 2017 | 7.71 | 11.68 | 5.48 |
| 2016 | 8.1 | 9.8 | 6.19 |
| 2015 | 10.07 | 14.72 | 6.33 |
| 2014 | 7.7 | 11.77 | 5.56 |
| 2013 | 8.11 | 9.73 | 6.07 |
| 2012 | 7.14 | 9.55 | 3.7 |
| 2011 | 10.27 | 16.72 | 3.69 |
| 2010 | 10.87 | 18.88 | 7.64 |
| 2009 | 6.33 | 11.13 | 1.83 |
| 2008 | 5.08 | 10.11 | 1.4 |
| 2007 | 7.53 | 13.4 | 4.09 |
| 2006 | 3.03 | 4.42 | 2.16 |
| 2005 | 2.18 | 2.93 | 1.67 |
| 2004 | 3.55 | 7.14 | 2.22 |