Question: when did nba start the 3 point line
[{'answer': 'in June 1979', 'provenance': [{'wikipedia_id': '2214267', 'title': 'Three-point field goal', 'start_paragraph_id': 8, 'start_character': 18, 'end_paragraph_id': 8, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2214267', 'title': 'Three-point field goal', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 521, 'bleu_score': 0.8878718174194631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13808353322478137934}, 'section': 'Section::::History.\n'}]}]