What's the percentage of abusive relationships with the leading cause of alcohol?

I am writing an essay for school on drugs, alcohol and abuse. I have looked every where for the statistics on abusive relationships involving alcohol but I just can't seem to find the numbers anywhere. Does anyone know where I can find these statistics other then google? Or does anyone know these statistics?What's the percentage of abusive relationships with the leading cause of alcohol?
the leading cause of abusive relationships is aggressive partners.

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