Question: when was the new zealand flag first used
[{'answer': '1869', 'provenance': [{'wikipedia_id': '265679', 'title': 'Flag of New Zealand', 'start_paragraph_id': 2, 'start_character': 566, 'end_paragraph_id': 2, 'end_character': 570, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '265679', 'title': 'Flag of New Zealand', 'start_paragraph_id': 2, 'start_character': 14, 'end_paragraph_id': 2, 'end_character': 663, 'bleu_score': 0.8660262939237551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2881724363826486683}, 'section': 'Section::::Abstract.'}]}]