Question: when did nba draft go to two rounds
[{'answer': '1989', 'provenance': [{'wikipedia_id': '835946', 'title': 'NBA draft', 'start_paragraph_id': 1, 'start_character': 898, 'end_paragraph_id': 1, 'end_character': 902, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '835946', 'title': 'NBA draft', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1229, 'bleu_score': 0.9601682555534221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2827735654911540460}, 'section': 'Section::::Abstract.'}]}]