Question: when is the sunday times rich list 2018 published
[{'answer': '13 May 2018', 'provenance': [{'wikipedia_id': '57405502', 'title': 'Sunday Times Rich List 2018', 'start_paragraph_id': 1, 'start_character': 150, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57405502', 'title': 'Sunday Times Rich List 2018', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12413063501518268845}, 'section': 'Section::::Abstract.'}]}]