Question: when did la paz become the capital of bolivia
[{'answer': '1898', 'provenance': [{'wikipedia_id': '42821', 'title': 'La Paz', 'start_paragraph_id': 14, 'start_character': 3, 'end_paragraph_id': 14, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '42821', 'title': 'La Paz', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 399, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15836668068431094935}, 'section': 'Section::::History.\n'}]}]