Question: when was the united farm workers union formed
[{'answer': '1962', 'provenance': [{'wikipedia_id': '294510', 'title': 'United Farm Workers', 'start_paragraph_id': 7, 'start_character': 316, 'end_paragraph_id': 7, 'end_character': 320, 'bleu_score': 1.0, 'section': 'Section::::History.:Founding of the UFW.\n'}]}, {'provenance': [{'wikipedia_id': '294510', 'title': 'United Farm Workers', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 690, 'bleu_score': 0.563905816945608, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13346365456851710509}, 'section': 'Section::::History.:Founding of the UFW.\n'}]}]