Question: when did the usps start using zip codes
[{'answer': '1963', 'provenance': [{'wikipedia_id': '51550', 'title': 'ZIP Code', 'start_paragraph_id': 1, 'start_character': 105, 'end_paragraph_id': 1, 'end_character': 109, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51550', 'title': 'ZIP Code', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 531, 'bleu_score': 0.8089422890422241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17259338409980062381}, 'section': 'Section::::Abstract.'}]}]