Question: when did the usa start celebrating hispanic heritage month
[{'answer': '1968', 'provenance': [{'wikipedia_id': '2675084', 'title': 'National Hispanic Heritage Month', 'start_paragraph_id': 5, 'start_character': 165, 'end_paragraph_id': 5, 'end_character': 169, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2675084', 'title': 'National Hispanic Heritage Month', 'start_paragraph_id': 5, 'start_character': 137, 'end_paragraph_id': 5, 'end_character': 589, 'bleu_score': 0.614625240945297, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1684946780123514735}, 'section': 'Section::::History.\n'}]}]