Question: when did amsterdam become capital of the netherlands
[{'answer': '1814', 'provenance': [{'wikipedia_id': '169683', 'title': 'Capital of the Netherlands', 'start_paragraph_id': 5, 'start_character': 156, 'end_paragraph_id': 5, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Historical background.\n'}]}, {'provenance': [{'wikipedia_id': '169683', 'title': 'Capital of the Netherlands', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 572, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 164684183735782176}, 'section': 'Section::::Historical background.\n'}]}]