Declension of the word "Wirkungsgrad"

Singular and plural for Wirkungsgrad, m, strong declension     translation to English efficiency

Singular
Plural
Singular
Nominativ (Wer? Was?)
der Wirkungsgrad
die Wirkungsgrade
Genitiv (Wessen?)
des Wirkungsgrades / Wirkungsgrads
der Wirkungsgrade
Dativ (Wem?)
dem Wirkungsgrad / Wirkungsgrade
den Wirkungsgraden
Akkusativ (Wen? Was?)
den Wirkungsgrad
die Wirkungsgrade
Plural
die Wirkungsgrade
der Wirkungsgrade
den Wirkungsgraden
die Wirkungsgrade
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