Question: when was the pacemaker invented in what year
[{'answer': '1982', 'provenance': [{'wikipedia_id': '80732', 'title': 'Artificial cardiac pacemaker', 'start_paragraph_id': 35, 'start_character': 333, 'end_paragraph_id': 35, 'end_character': 337, 'bleu_score': 1.0, 'section': 'Section::::Advancements in function.\n'}]}, {'provenance': [{'wikipedia_id': '80732', 'title': 'Artificial cardiac pacemaker', 'start_paragraph_id': 34, 'start_character': 0, 'end_paragraph_id': 34, 'end_character': 370, 'bleu_score': 0.531023084357664, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1786152997715305933}, 'section': 'Section::::Advancements in function.\n'}]}]