| International Letter Writing Week 1957 - Saar, Syria (2) |
|
1957 |
| International Letter Writing Week 1959 |
Japan |
1959 |
| International Letter Writing Week 1966 - Korea, Laos (2) |
|
1966 |
| International Letter Writing Week 1968 |
Burundi |
1968 |
| International Letter Writing Week 1969 - Burundi, Japan (2) |
|
1969 |
| International Letter Writing Week 1971 - Burundi, Japan (2) |
|
1971 |
| International Letter Writing Week 1972 |
Japan |
1972 |
| International Letter Writing Week 1973 - Japan, Thailand (2) |
|
1973 |
| International Letter Writing Week 1974 - Burundi, Thailand (2) |
|
1974 |
| International Letter Writing Week 1975 |
Thailand |
1975 |
| International Letter Writing Week 1976 - Japan, Thailand (2) |
|
1976 |
| International Letter Writing Week 1977 - Japan, Thailand (2) |
|
1977 |
| International Letter Writing Week 1978 - Japan, Thailand (2) |
|
1978 |
| International Letter Writing Week 1979 |
Thailand |
1979 |
| International Letter Writing Week 1980 |
Japan |
1980 |
| International Letter Writing Week 1981 - Gabon, Japan, Niger, Thailand (4) |
|
1981 |
| International Letter Writing Week 1982 - Japan, Thailand (2) |
|
1982 |
| International Letter Writing Week 1983 - Japan, Thailand (2) |
|
1983 |
| International Letter Writing Week 1984 |
Thailand |
1984 |
| International Letter Writing Week 1985 - Japan, Thailand (2) |
|
1985 |
| International Letter Writing Week 1986 - Japan, Thailand (2) |
|
1986 |
| International Letter Writing Week 1987 - Japan, Thailand (2) |
|
1987 |
| International Letter Writing Week 1988 - Indonesia, Japan, Russia, Thailand (4) |
|
1988 |
| International Letter Writing Week 1989 - Japan, Papua New Guinea, Russia, Thailand (4) |
|
1989 |
| International Letter Writing Week 1990 - Russia, Thailand (2) |
|
1990 |
| International Letter Writing Week 1991 - Chile, Japan, Thailand (3) |
|
1991 |
| International Letter Writing Week 1992 - Japan, Thailand (2) |
|
1992 |
| International Letter Writing Week 1993 - Japan, Thailand (2) |
|
1993 |
| International Letter Writing Week 1994 - Japan, Thailand (2) |
|
1994 |
| International Letter Writing Week 1995 - Japan, Thailand (2) |
|
1995 |
| International Letter Writing Week 1996 - Burma, Japan, Thailand (3) |
|
1996 |
| International Letter Writing Week 1997 - Japan, Thailand (2) |
|
1997 |
| International Letter Writing Week 1998 - Japan, Thailand (2) |
|
1998 |
| International Letter Writing Week 1999 - Japan, Thailand (2) |
|
1999 |
| International Letter Writing Week 2000 - Japan, Thailand (2) |
|
2000 |
| International Letter Writing Week 2001 |
Japan |
2001 |
| International Letter Writing Week 2002 - Japan, Thailand (2) |
|
2002 |
| International Letter Writing Week 2003 - Japan, Thailand (2) |
|
2003 |
| International Letter Writing Week 2004 - Japan, Thailand (2) |
|
2004 |
| International Letter Writing Week 2005 - Japan, Thailand (2) |
|
2005 |
| International Letter Writing Week 2006 / 50 Years of Japan's Accession to the United Nations |
Japan |
2006 |
| International Letter Writing Week 2006 |
Thailand |
2006 |
| International Letter Writing Week 2007 - Japan, Thailand (2) |
|
2007 |
| International Letter Writing Week 2008 - Japan, Thailand (2) |
|
2008 |
| International Letter Writing Week 2009 - Japan, Thailand (2) |
|
2009 |
| International Letter Writing Week 2010 - Japan, Thailand (2) |
|
2010 |
| International Letter Writing Week 2011 - Japan, Thailand (2) |
|
2011 |
| International Letter Writing Week 2012 - Japan, Thailand (2) |
|
2012 |
| International Letter Writing Week 2013 - Japan, Thailand (2) |
|
2013 |
| International Letter Writing Week 2014 |
Japan |
2014 |
| International Letter Writing Week 2015 |
Japan |
2015 |
| International Letter Writing Week 2016 |
Japan |
2016 |
| International Letter Writing Week 2017 |
Japan |
2017 |
