Question: when did they stop making pull tabs on beer cans
[{'answer': '1970s', 'provenance': [{'wikipedia_id': '383115', 'title': 'Drink can', 'start_paragraph_id': 9, 'start_character': 995, 'end_paragraph_id': 9, 'end_character': 1000, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': '1990'}, {'provenance': [{'wikipedia_id': '383115', 'title': 'Drink can', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10850737243177090616}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '383115', 'title': 'Drink can', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 450, 'bleu_score': 0.9132688781618751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10850737243177090616}, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '383115', 'title': 'Drink can', 'start_paragraph_id': 71, 'start_character': 0, 'end_paragraph_id': 71, 'end_character': 124, 'bleu_score': 0.8720290467146471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10850737243177090616}, 'section': 'Section::::Opening mechanisms.:Stay-on-tab.\n'}]}, {'provenance': [{'wikipedia_id': '18100391', 'title': "Snouder's Drug Store", 'section': 'Section::::History.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['This soda fountain became a center of social life for several generations of kids, into the 1970s. In the 1990s the exterior was returned to its original color, which was determined through paint chip analysis. After many', "In the 1990s the exterior was returned to its original color, which was determined through paint chip analysis. After many decades Snouder's shut its doors in December, 2010. The building was at that time listed for sale by Long Island Realty Agents\rhighlight sentence(s) containing evidence, not only the answer", 'In the 1990s the exterior was returned to its original color, which was determined through paint chip analysis.']}}]}]