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Research on ancient village documents.
| year | Number of documents |
|---|---|
| 1990 | 1 |
| 1991 | 1 |
| 1995 | 2 |
| 1996 | 1 |
| 1997 | 5 |
| 1998 | 6 |
| 1999 | 8 |
| 2000 | 11 |
| 2001 | 9 |
| 2002 | 25 |
| 2003 | 26 |
| 2004 | 38 |
| 2005 | 31 |
| 2006 | 44 |
| 2007 | 70 |
| 2008 | 56 |
| 2009 | 60 |
| 2010 | 78 |
| 2011 | 48 |
| 2012 | 60 |
| 2013 | 69 |
| 2014 | 68 |
| 2015 | 57 |
| 2016 | 74 |
| 2017 | 69 |
| 2018 | 85 |
| 2019 | 83 |
