Task: Question Generation
Input (English): Schwarzenegger has admitted to using performance-enhancing anabolic steroids while they were legal, writing in 1977 that "steroids were helpful to me in maintaining muscle size while on a strict diet in preparation for a contest. I did not use them for muscle growth, but rather for muscle maintenance when cutting up." He has called the drugs "tissue building."
Output (English): In what year did Schwarzenegger write that he used anabolic steroid because they were "helpful"?