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October 1976
Osnabrück (Niedersachsen, Germany)
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September 11 – 15, 1996
Osnabrück (Niedersachsen, Germany)
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May 7 – 11, 1997
Osnabrück (Niedersachsen, Germany)
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May 6 – 11, 1998
Osnabrück (Niedersachsen, Germany)
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May 5 – 9, 1999
Osnabrück (Niedersachsen, Germany)
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May 3 – 7, 2000
Osnabrück (Niedersachsen, Germany)
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April 25 – 29, 2001
Osnabrück (Niedersachsen, Germany)
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April 24 – 28, 2002
Osnabrück (Niedersachsen, Germany)
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April 23 – 27, 2003
Osnabrück (Niedersachsen, Germany)
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April 21 – 25, 2004
Osnabrück (Niedersachsen, Germany)
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April 20 – 24, 2005
Osnabrück (Niedersachsen, Germany)
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April 22 – 26, 2009
Osnabrück (Niedersachsen, Germany)
