| Year | Sister Provinces | Total |
| 1979 | 2 | 2 |
| 1980 | 0 | 2 |
| 1981 | 1 | 3 |
| 1982 | 1 | 4 |
| 1983 | 2 | 6 |
| 1984 | 0 | 6 |
| 1985 | 3 | 9 |
| 1986 | 3 | 12 |
| 1987 | 1 | 13 |
| 1988 | 3 | 16 |
| 1989 | 2 | 18 |
| 1990 | 1 | 19 |
| 1991 | 1 | 20 |
| 1992 | 1 | 21 |
| 1993 | 2 | 23 |
| 1994 | 7 | 30 |
| 1995 | 3 | 33 |
| 1996 | 2 | 35 |
| 1997 | 7 | 42 |
| 1998 | 1 | 43 |
| 1999 | 0 | 43 |
| 2000 | 3 | 46 |
| 2001 | 4 | 50 |
| 2002 | 3 | 53 |
| 2003 | 3 | 56 |
| 2004 | 8 | 64 |
| 2005 | 5 | 69 |
| 2006 | 5 | 74 |
| 2007 | 6 | 80 |
| 2008 | 5 | 85 |
| 2009 | 7 | 92 |
| 2010 | 9 | 101 |
| 2011 | 9 | 110 |
| 2012 | 21 | 131 |
| 2013 | 7 | 138 |
| 2014 | 18 | 156 |
| 2015 | 12 | 168 |
| 2016 | 12 | 180 |
| 2017 | 10 | 190 |
Acknowledgements
School of Foreign Studies, South China Normal University; Southcn.com, Nanfang Media Group
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