Question: when was the last year lead paint was used
[{'answer': '1978', 'provenance': [{'wikipedia_id': '1970496', 'title': 'Lead paint', 'start_paragraph_id': 1, 'start_character': 794, 'end_paragraph_id': 1, 'end_character': 798, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1970496', 'title': 'Lead paint', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1028, 'bleu_score': 0.8644862142082761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17800544553925850173}, 'section': 'Section::::Abstract.'}]}]