Question: when did the 50 cent coin come out
[{'answer': 'December 1 , 1794', 'provenance': [{'wikipedia_id': '374699', 'title': 'Half dollar (United States coin)', 'start_paragraph_id': 8, 'start_character': 3, 'end_paragraph_id': 8, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Aspects of early history.\n'}]}, {'provenance': [{'wikipedia_id': '374699', 'title': 'Half dollar (United States coin)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 428, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6495955665791196650}, 'section': 'Section::::Aspects of early history.\n'}]}]