Question: what is the population of williston north dakota
[{'answer': '26,977'}, {'provenance': [{'wikipedia_id': '128870', 'title': 'Williston, North Dakota', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 349, 'bleu_score': 0.8786307771674821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17989341930282137686}, 'section': 'Section::::Abstract.'}]}]