Question: when did the wave hill walk off end
[{'answer': '16 August 1975', 'provenance': [{'wikipedia_id': '1422478', 'title': 'Wave Hill walk-off', 'start_paragraph_id': 43, 'start_character': 246, 'end_paragraph_id': 43, 'end_character': 260, 'bleu_score': 1.0, 'section': 'Section::::1975 – Handback.\n'}]}, {'provenance': [{'wikipedia_id': '1422478', 'title': 'Wave Hill walk-off', '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': 16306390498459057467}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1422478', 'title': 'Wave Hill walk-off', 'start_paragraph_id': 43, 'start_character': 0, 'end_paragraph_id': 43, 'end_character': 348, 'bleu_score': 0.9645876452711911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16306390498459057467}, 'section': 'Section::::1975 – Handback.\n'}]}, {'provenance': [{'wikipedia_id': '1422478', 'title': 'Wave Hill walk-off', 'section': 'Section::::1975 – Handback.\n', 'start_paragraph_id': 43, 'end_paragraph_id': 43, 'meta': {'evidence_span': ['In 1975, the Labor government of Gough Whitlam finally negotiated with Vesteys to give the Gurindji back a portion of their land. This was a landmark in the land rights movement in Australia for Indigenous Australians. The handback took place on 16 August 1975 at Kalkaringi.', 'his was a landmark in the land rights movement in Australia for Indigenous Australians. The handback took place on 16 August 1975 at Kalkaringi.', 'This was a landmark in the land rights movement in Australia for Indigenous Australians. The handback took place on 16 August 1975 at Kalkaringi.']}}]}]