| 时间(年) | ≤20 (岁) | 21~40 (岁) | 41~60 (岁) | >60 (岁) | 合计 |
| 2008~2009 | 20 (19.4%) | 34 (33.0%) | 36 (35.0%) | 13 (12.6%) | 103 |
| 2010~2011 | 29 (21.2%) | 23 (16.7%) | 68 (49.6%) | 17 (12.4%) | 137 |
| 2012~2013 | 16 (11.0%) | 31 (21.4%) | 79 (54.5%) | 19 (13.1%) | 145 |
| 合计 | 65 (16.9%) | 88 (22.9%) | 183 (47.5%) | 49 (12.7%) | 385 |