Rubuta ci gaba don wannan sakin layi - Köster kuma ya lashe lambar zinare hudu a gasar zakarun duniya ta ICF Canoe Sprint tare da biyu a cikin K-2 500 m taron (duka 1974 da 1975
) da biyu a cikin K-4 500 m taron (duka 1974 da 1975).