Question: when was united nations convention on the rights of the child created
[{'answer': '20 November 1989', 'provenance': [{'wikipedia_id': '46489', 'title': 'Convention on the Rights of the Child', 'start_paragraph_id': 4, 'start_character': 78, 'end_paragraph_id': 4, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46489', 'title': 'Convention on the Rights of the Child', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 373, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13972134400059924763}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46489', 'title': 'Convention on the Rights of the Child', 'section': 'Section::::Abstract.', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['The UN General Assembly adopted the Convention and opened it for signature on 20 November 1989', 'The UN General Assembly adopted the Convention and opened it for signature on 20 November 1989 (the 30th anniversary of its Declaration of the Rights of the Child).', 'The UN General Assembly adopted the Convention and opened it for signature on 20 November 1989 (the 30th anniversary of its Declaration of the Rights of the Child). It came into force on 2 September 1990, after it was ratified by the required number of nations. Currently, 196 countries are party to it, including every member of the United Nations except the United States.']}}]}]