发表年代 | 数据收集年代 | 文献数量 | 样本量 | 男生/女生 (篇数) | 城市/农村 (篇数) |
1999 | 1997 | 1 | 214 | 0 | 0 |
2000 | 1998 | 1 | 549 | 1 | 0 |
2003 | 2001 | 1 | 424 | 0 | 0 |
2004 | 2002 | 2 | 662 | 1 | 1 |
2005 | 2003 | 1 | 251 | 0 | 0 |
2006 | 2004 | 1 | 202 | 1 | 0 |
2007 | 2005 | 4 | 1462 | 4 | 2 |
2008 | 2006 | 5 | 2083 | 5 | 3 |
2009 | 2007 | 3 | 694 | 2 | 2 |
2010 | 2008 | 14 | 4855 | 12 | 7 |
2011 | 2009 | 14 | 5745 | 11 | 5 |
2012 | 2010 | 11 | 6014 | 4 | 1 |
2013 | 2011 | 9 | 3937 | 6 | 4 |
2014 | 2012 | 7 | 3628 | 5 | 1 |
2015 | 2013 | 16 | 9157 | 9 | 7 |
2016 | 2014 | 15 | 8171 | 4 | 5 |
2017 | 2015 | 20 | 10,205 | 10 | 5 |
2018 | 2016 | 20 | 8809 | 10 | 4 |
2019 | 2017 | 15 | 7689 | 8 | 3 |
2020 | 2018 | 17 | 10,454 | 7 | 3 |
总计 |
| 177 | 85,205 | 100 | 53 |