Question: when did the national lottery start in uk
[{'answer': '1993', 'provenance': [{'wikipedia_id': '19470410', 'title': 'National Lottery (United Kingdom)', 'start_paragraph_id': 10, 'start_character': 105, 'end_paragraph_id': 10, 'end_character': 109, 'bleu_score': 1.0, 'section': 'Section::::History.:20th century.\n'}]}]