Country

• Brazil (3) 

  Canada (2) Chile (1) Dominica (1) Netherlands Antilles (5) Paraguay (3) St.Vincent and Grenadines (2) United Nations (3) United States (5) Uruguay (4)

Year

• 1978 (3) 

  1916 (2) 1958 (1) 1977 (2) 1979 (5) 1980 (8) 1981 (8) 1982 (9) 1983 (8) 1984 (10) 1985 (5) 1986 (7) 1987 (7) 1988 (10) 1989 (10) 1990 (5) 1991 (1) 1992 (1) 2004 (4) 2006 (1) 2008 (4) 2009 (2)

Themes

•  Fine arts (1)
•  History (1)
•  Post (1)