Question: when did the u.s. create a lottery system for immigration
[{'answer': '1990', 'provenance': [{'wikipedia_id': '490086', 'title': 'Diversity Immigrant Visa', 'start_paragraph_id': 1, 'start_character': 200, 'end_paragraph_id': 1, 'end_character': 204, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '490086', 'title': 'Diversity Immigrant Visa', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 674, 'bleu_score': 0.9587365925518061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7885828640731301043}, 'section': 'Section::::History.:Legislative and administrative history.\n'}]}]