Question: when did fathers day become an official holiday
[{'answer': '1972', 'provenance': [{'wikipedia_id': '46280', 'title': "Father's Day", 'start_paragraph_id': 19, 'start_character': 1026, 'end_paragraph_id': 19, 'end_character': 1030, 'bleu_score': 1.0, 'section': 'Section::::History.:In the United States.:Establishment of the holiday.\n'}]}, {'provenance': [{'wikipedia_id': '46280', 'title': "Father's Day", 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 1030, 'bleu_score': 0.987987443031558, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2137084665287414360}, 'section': 'Section::::History.:In the United States.:Establishment of the holiday.\n'}]}]