Düsseldorf, Germany
every 3 years

Munich, Germany
every 2 years

Frankfurt, Germany
every 2 years

Berlin, Germany
every 2 years

Düsseldorf, Germany
every 4 years

Düsseldorf, Germany
every 2 years

Munich, Germany
every 3 years

Hanover, Germany
yearly

Nuremberg, Germany
yearly

Hanover, Germany
every 2 years

Hanover, Germany
every 2 years

Hanover, Germany
every 3 years

Essen, Germany
every 4 years

Frankfurt, Germany
yearly

Düsseldorf, Germany
every 3 years

Stuttgart, Germany
yearly

Cologne, Germany
yearly

Munich, Germany
yearly

Frankfurt, Germany
yearly

Milan, Italy
yearly

Frankfurt, Germany
yearly

Frankfurt, Germany—every 2 years

Hanover, Germany
yearly

Düsseldorf, Germany—every 3 years

Bologna, Italy
yearly

Milan, Italy
yearly

Cologne, Germanyirregular cycle

Frankfurt, Germany
yearly