Question: when was the first aldi store opened in the uk
[{'answer': '1990', 'provenance': [{'wikipedia_id': '404177', 'title': 'Aldi', 'start_paragraph_id': 18, 'start_character': 43, 'end_paragraph_id': 18, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Business organization.:Internationally.\n'}]}]