Duty cycle = 10 %,  RMS Current = 32A

Duty cycle = 20 %,  RMS Current = 53A

Duty cycle = 30 %,  RMS Current = 69 A

Duty cycle =  40 %,  RMS Current = 81A

Duty cycle = 50 %,  RMS Current = 93 A

Duty cycle = 60 %,  RMS Current = 102 A

Duty cycle = 70 %,  RMS Current = 112 A

Duty cycle = 80 %,  RMS Current = 120 A

Duty cycle = 90 %,  RMS Current = 129 A

The program used to generate current and RMS values is available here.