Question: when did the drought started in south africa
[{'answer': '2015', 'provenance': [{'wikipedia_id': '54197701', 'title': 'Cape Town water crisis', 'start_paragraph_id': 1, 'start_character': 204, 'end_paragraph_id': 1, 'end_character': 208, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54197701', 'title': 'Cape Town water crisis', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 450, 'bleu_score': 0.7107572689647501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10439089726039408370}, 'section': 'Section::::Timeline.:2015–2016.\n'}]}]