Question: when was the last time the world population fallen
[{'answer': '1350', 'provenance': [{'wikipedia_id': '19017269', 'title': 'World population', 'start_paragraph_id': 2, 'start_character': 129, 'end_paragraph_id': 2, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]