Question: when did heritage day become a public holiday
[{'answer': '1995', 'provenance': [{'wikipedia_id': '2681840', 'title': 'Heritage Day (South Africa)', 'start_paragraph_id': 2, 'start_character': 42, 'end_paragraph_id': 2, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2681840', 'title': 'Heritage Day (South Africa)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 747, 'bleu_score': 0.9776936083070831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2906913230849767779}, 'section': 'Section::::History of Heritage Day before 1995.\n'}]}]