Question: when did cds first appear on the market
[{'answer': '1982', 'provenance': [{'wikipedia_id': '6429', 'title': 'Compact disc', 'start_paragraph_id': 1, 'start_character': 122, 'end_paragraph_id': 1, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6429', 'title': 'Compact disc', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 608, 'bleu_score': 0.9044336637384801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13030012760793180526}, 'section': 'Section::::Abstract.'}]}]