-
Prague, Czechoslovakia, 6–9 July 1987
-
Prague, Czechoslovakia, 7–10 July 1986
-
Prague, Czechoslovakia, 8–11 July 1985
-
Prague, Czechoslovakia, 16–19 July 1984
-
Prague, Czechoslovakia, 9–12 July 1984
-
Prague, Czechoslovakia, 18–21 July 1983
-
Prague, Czechoslovakia, 11–14 July 1983
-
Prague, Czechoslovakia, 19–22 July 1982
-
Prague, Czechoslovakia, 20–23 July 1981
-
Karlovy Vary, Czechoslovakia, 22–26 September 1980
-
Prague, Czechoslovakia, 16–19 July 1979
-
Prague, Czechoslovakia, 9–12 July 1979
-
Prague, Czechoslovakia, 10–13 July 1978
-
Prague, Czechoslovakia, 12–16 July 1976
-
Marianske Lazne, Czechoslovakia, 26–29 August 1974
-
Prague, Czechoslovakia, 27–30 August 1973
-
Prague, Czechoslovakia, 20–23 August 1973
-
Prague, Czechoslovakia, 28 August–2 September 1972
-
Prague, Czechoslovakia, 28 August–2 September 1972
-
Prague, Czechoslovakia, 30 August–9 September 1971
-
Prague, Czechoslovakia, 30 August–9 September 1971
-
Prague, Czechoslovakia, 7–10 September 1970
-
Prague, Czechoslovakia, 1–11 September 1969
-
Prague, Czechoslovakia, 23–26 September 1968
-
Prague, Czechoslovakia, 16–19 September 1968