Question: when did most countries of sub saharan africa gain independence
[{'answer': '1950s', 'provenance': [{'wikipedia_id': '27067', 'title': 'Sub-Saharan Africa', 'start_paragraph_id': 64, 'start_character': 11, 'end_paragraph_id': 64, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::History.:Southern Africa.\n'}]}, {'answer': '1960s', 'provenance': [{'wikipedia_id': '27067', 'title': 'Sub-Saharan Africa', 'start_paragraph_id': 57, 'start_character': 17, 'end_paragraph_id': 57, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::History.:East Africa.:Southeast Africa.\n'}]}, {'provenance': [{'wikipedia_id': '27067', 'title': 'Sub-Saharan Africa', 'start_paragraph_id': 64, 'start_character': 0, 'end_paragraph_id': 64, 'end_character': 107, 'bleu_score': 0.69647056655157, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2989110671760352362}, 'section': 'Section::::History.:Southern Africa.\n'}]}]