What percentage of the revenue of American commercial shipping activity would that be? 1%? 10%? 50%? I'm curious if America felt forced to act because the tribu

What percentage of the revenue of American commercial shipping activity would that be? 1%? 10%? 50%? I'm curious if America felt forced to act because the tributes were literally breaking the bank, or of it was just a cost/benefit analysis(ie we pay $2M/yr but we can blow up their fleet for a one time cost of $3M), or an ethical one.