Question: when did rabat become the capital of morocco
[{'answer': '1912', 'provenance': [{'wikipedia_id': '57400', 'title': 'Rabat', 'start_paragraph_id': 2, 'start_character': 316, 'end_paragraph_id': 2, 'end_character': 320, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57400', 'title': 'Rabat', 'start_paragraph_id': 13, 'start_character': 174, 'end_paragraph_id': 13, 'end_character': 757, 'bleu_score': 0.760544682752446, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3311743060252028769}, 'section': 'Section::::History.:20th century.:French invasion.\n'}]}]