Question: when was south african youth day first celebrated
[{'answer': '1976', 'provenance': [{'wikipedia_id': '358719', 'title': 'Youth Day', 'start_paragraph_id': 36, 'start_character': 172, 'end_paragraph_id': 36, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::South Africa.\n'}]}, {'answer': 'June 16'}, {'provenance': [{'wikipedia_id': '358719', 'title': 'Youth Day', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13874859876819551609}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '358719', 'title': 'Youth Day', 'start_paragraph_id': 36, 'start_character': 0, 'end_paragraph_id': 36, 'end_character': 677, 'bleu_score': 0.7885313002663601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13874859876819551609}, 'section': 'Section::::South Africa.\n'}]}, {'provenance': [{'wikipedia_id': '358719', 'title': 'Youth Day', 'section': 'Section::::South Africa.\n', 'start_paragraph_id': 36, 'end_paragraph_id': 36, 'meta': {'evidence_span': ['Youth Day on 16 June is a public holiday in South Africa and commemorates a protest which resulted in a wave of protests across the country known as the Soweto uprising of 1976.', 'Youth Day on 16 June is a public holiday in South Africa and commemorates a protest which resulted in a wave of protests across the country known as the Soweto uprising of 1976.', 'Youth Day on 16 June is a public holiday in South Africa and commemorates a protest which resulted in a wave of protests across the country known as the Soweto uprising of 1976']}}]}]