Question: when did the world's population increased the fastest
[{'answer': '1989', 'provenance': [{'wikipedia_id': '940606', 'title': 'Population growth', 'start_paragraph_id': 32, 'start_character': 77, 'end_paragraph_id': 32, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Human population growth rate.\n'}]}, {'provenance': [{'wikipedia_id': '940606', 'title': 'Population growth', 'start_paragraph_id': 32, 'start_character': 0, 'end_paragraph_id': 32, 'end_character': 498, 'bleu_score': 0.946458428441119, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16321888530083135567}, 'section': 'Section::::Human population growth rate.\n'}]}]