| 52 | 2011 | Netherlands | | | | |
| 51 | 2010 | Kazakhstan | Astana | | | |
| 50 | 2009 | Germany | Bremen | 10.7. - 22.7. | | |
| 49 | 2008 | Spain | Madrid | 10.7. - 22.7. | | |
| 48 | 2007 | Vietnam | Hanoi | 19.7. - 31.7. | 93 | 520; 49♀ |
| 47 | 2006 | Slovenia | Ljubljana | 6.7. - 18.7. | 90 | 498; 39♀ |
| 46 | 2005 | Mexico | Mérida | 8.7. - 19.7. | 91 | 513 |
| 45 | 2004 | Greece | Athens | 6.7. - 18.7. | 85 | 486 |
| 44 | 2003 | Japan | Tokyo | 7.7. - 19.7. | 82 | 457 |
| 43 | 2002 | United Kingdom | Glasgow | 19.7. - 30.7. | 84 | 479 |
| 42 | 2001 | United States of America | Washington | 1.7. - 14.7. | 83 | 473 |
| 41 | 2000 | Republic of Korea | Taejon | 13.7. - 25.7. | 82 | 461 |
| 40 | 1999 | Romania | Bucharest | 10.7. - 22.7. | 81 | 450 |
| 39 | 1998 | Taiwan | Taipeh | 10.7. - 21.7. | 76 | 419 |
| 38 | 1997 | Argentina | Mar del Plata | 18.7. - 31.7. | 82 | 460 |
| 37 | 1996 | India | Mumbai | 5.7. - 17.7. | 75 | 424 |
| 36 | 1995 | Canada | Toronto | 13.7. - 25.7. | 73 | 412 |
| 35 | 1994 | Hong Kong | Hong Kong | 8.7. - 20.7. | 69 | 385 |
| 34 | 1993 | Turkey | Istanbul | 13.7. - 24.7. | 73 | 413 |
| 33 | 1992 | Russian Federation | Moscow | 10.7. - 21.7. | 56 | 322 |
| 32 | 1991 | Sweden | Sigtuna | 12.7. - 23.7. | 56 | 318 |
| 31 | 1990 | People's Republic of China | Beijing | 8.7. - 19.7. | 54 | 308 |
| 30 | 1989 | Germany | Braunschweig | 13.7. - 24.7. | 50 | 291 |
| 29 | 1988 | Australia | Canberra | 9.7. - 21.7. | 49 | 268 |
| 28 | 1987 | Cuba | Havanna | 5.7. - 16.7. | 42 | 237 |
| 27 | 1986 | Poland | Warsaw | 4.7. - 15.7. | 37 | 210 |
| 26 | 1985 | Finland | Joutsa | 29.6. - 11.7. | 38 | 209 |
| 25 | 1984 | Czechoslovakia | Prague | 29.6. - 10.7. | 34 | 192 |
| 24 | 1983 | France | Paris | 1.7. - 12.7. | 32 | 186 |
| 23 | 1982 | Hungary | Budapest | 5.7. - 14.7. | 30 | 119 |
| 22 | 1981 | United States of America | Washington | 8.7. - 20.7. | 27 | 185 |
| 21 | 1979 | United Kingdom | London | 30.6. - 9.7. | 23 | 166 |
| 20 | 1978 | Romania | Bucharest | 3.7. - 10.7. | 17 | 132 |
| 19 | 1977 | Yugoslavia | Belgrade | 1.7. - 13.7. | 21 | 155 |
| 18 | 1976 | Austria | Lienz | 7.7. - 21.7. | 18 | 139 |
| 17 | 1975 | Bulgaria | Burgas | 3.7. - 16.7. | 17 | 135 |
| 16 | 1974 | German Democratic Republic | Erfurt | 4.7. - 17.7. | 18 | 140 |
| 15 | 1973 | Union of the Soviet socialist republics | Moscow | 5.7. - 16.7. | 16 | 125 |
| 14 | 1972 | Poland | Toruń | 5.7. - 17.7. | 14 | 107 |
| 13 | 1971 | Czechoslovakia | Žilina | 10.7. - 21.7. | 15 | 115 |
| 12 | 1970 | Hungary | Keszthely | 8.7. - 22.7. | 14 | 112 |
| 11 | 1969 | Romania | Bucharest | 5.7. - 20.7. | 14 | 112 |
| 10 | 1968 | Union of the Soviet socialist republics | Moscow | 5.7. - 18.7. | 12 | 96 |
| 9 | 1967 | Yugoslavia | Cetinje | 2.7. - 13.7. | 13 | 99 |
| 8 | 1966 | Bulgaria | Sofia | 3.7. - 13.7. | 9 | 72 |
| 7 | 1965 | German Democratic Republic | Berlin | 3.7. - 13.7. | 10 | 80 |
| 6 | 1964 | Union of the Soviet socialist republics | Moscow | 30.6. - 10.7. | 9 | 72 |
| 5 | 1963 | Poland | Wrocław | 5.7. - 13.7. | 8 | 64 |
| 4 | 1962 | Czechoslovakia | České Budějovice | 7.7. - 15.7. | 7 | 56 |
| 3 | 1961 | Hungary | Veszprém | 6.7. - 16.7. | 6 | 48 |
| 2 | 1960 | Romania | Sinaia | 18.7. - 25.7. | 5 | 39 |
| 1 | 1959 | Romania | Braşov | 23.7. - 31.7. | 7 | 52 |
