The number of IMO host countries, champions and participating countries (regions) in previous years are: the number of participating countries and regions in the year of hosting the championship 1959 1 Romania 7 1960 2 Romania, former Czechoslovakia 5 196 1 3 Hungary 6/kloc-. 5 Polish former Soviet Union 8 1964 6 former Soviet Union 9 1965 7 former East Germany former Soviet Union 8 1966 8 Bulgarian former Soviet Union 9 1967 9 former Yugoslavia former Soviet Union 13 1968 6 5438+00 former Soviet Union and Kloc-0/969 65438 Slovakia Hungary 15 1972 14 Polish Soviet Union 14 1973 15 Soviet Union16/Kloc-. +0975 17 Bulgaria and Hungary 1976 18 Australia and the former Soviet Union191977/9 Yugoslavia and the United States 2 1 1978 20 17 1979 2 1 U.S.S.A. 23 198 1 22 U.S.A. 27 1982 23 Hungary's former West Germany 30 1983 24 France's former West Germany 32/kloc 5 The former Czechoslovakia, the former Soviet Union 34/KOOC-0/985 26 Finland, Romania 42/KOOC-0/986 27 Poland, the United States, the former Soviet Union 37/KOOC-0/987 28 Cuba Romania 42/KOOC-0/988 29 Australia, the former Soviet Union 49/KOOC-0/989 30 former West Germany. 990 3 1 China China 54 6543832 Sweden, the former Soviet Union 56 1992 33 Russia China 62 1993 34 Turkey China 65 1994 35 China Hong Kong USA 69 1995 36 Canada China 73/KLOC. Romania 75 1997 38 China 82 1998 39 China Taipei Iran 84 1999 40 China Romania Russia 8 1 2000 4 1 China 82 200 1 42 China 83 2002 43 China 88. Colombian China 98 2006 47 Slovenian China 104 2007 48 Vietnamese Russia 93 2008 49 Spanish China 103 2009 50 German China 104 20 10 5 1 Hasek. Tan China 105 20 1 1 52 China, Netherlands1kloc-0/253 Argentina and Korea 100 20 1354 China, Colombia 97201454.