Question: when was the post it note first sold
[{'answer': '1977', 'provenance': [{'wikipedia_id': '598223', 'title': 'Post-it Note', 'start_paragraph_id': 5, 'start_character': 80, 'end_paragraph_id': 5, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '598223', 'title': 'Post-it Note', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 478, 'bleu_score': 0.9273566911694281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1023812473968605184}, 'section': 'Section::::History.\n'}]}]