• 1885 Brussels, Belgium
• 1886 Vienna, Austria
• 1888 Frankfurt, Germany
• 1890 Manchester, UK
• 1892 Paris, France
• 1894 The Hague, The Netherlands
• 1898 Brussels, Belgium
• 1900 Paris, France
• 1902 Düsseldorf, Germany
• 1905 Milan, Italy
• 1908 St. Petersburg, Russia
• 1912 Philadelphia, USA
• 1923 London, UK
• 1926 Cairo, Egypt
• 1931 Venice, Italy
• 1935 Brussels, Belgium
• 1949 Lisbon, Portugal
• 1953 Rome, Italy
• 1957 London, UK
• 1961 Baltimore, USA
• 1965 Stockholm, Sweden
• 1969 Paris, France
• 1973 Ottawa, Canada
• 1977 Leningrad, USSR
• 1981 Edinburgh, UK
• 1985 Brussels, Belgium
• 1990 Osaka, Japan
• 1994 Sevilla, Spain
• 1998 The Hague, The Netherlands

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