Question: when did the draft began for the vietnam war
[{'answer': '1970', 'provenance': [{'wikipedia_id': '549085', 'title': 'Draft lottery (1969)', 'start_paragraph_id': 15, 'start_character': 4, 'end_paragraph_id': 15, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Aftermath and modification.\n'}]}]