Question: when did the summer food service program start
[{'answer': '1968', 'provenance': [{'wikipedia_id': '38506825', 'title': 'Summer Food Service Program', 'start_paragraph_id': 1, 'start_character': 48, 'end_paragraph_id': 1, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38506825', 'title': 'Summer Food Service Program', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 722, 'bleu_score': 0.9608889364388631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2596773233973771346}, 'section': 'Section::::Abstract.'}]}]