Question: when did we decide to leave the eu
[{'answer': '23 June 2016', 'provenance': [{'wikipedia_id': '41688778', 'title': 'Brexit', 'start_paragraph_id': 1, 'start_character': 155, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '41688778', 'title': 'Brexit', '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': 4376648735631687394}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53704', 'title': 'Treaty on European Union', 'section': 'Section::::Provisions.:Title VI: Final provisions.\n', 'start_paragraph_id': 22, 'end_paragraph_id': 22, 'meta': {'evidence_span': ['Article 49 deals with applications to join the EU and article 50 with withdrawal. In the aftermath of the Brexit vote in Britain on June 23, 2016', '. In the aftermath of the Brexit vote in Britain on June 23, 2016, the United Kingdom formally invoked Article 50 in March 2017, giving notice that it would leave the EU within two years.', 'In the aftermath of the Brexit vote in Britain on June 23, 2016, the United Kingdom formally invoked Article 50 in March 2017, giving notice that it would leave the EU within two years.']}}]}, {'provenance': [{'wikipedia_id': '41688778', 'title': 'Brexit', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Brexit (; a portmanteau of "British" and "exit") is the withdrawal of the United Kingdom (UK) from the European Union (EU). Following a referendum held on 23 June 2016', "Following a referendum held on 23 June 2016 in which 51.9 percent of those voting supported leaving the EU, the Government invoked Article 50 of the Treaty on European Union, starting a two-year process which was due to conclude with the UK's exit on 29 March 2019.", 'Brexit (; a portmanteau of "British" and "exit") is the withdrawal of the United Kingdom (UK) from the European Union (EU). Following a referendum held on 23 June 2016 in which 51.9 percent of those voting supported leaving the EU, the Government invoked Article 50 of the Treaty on European Union, starting a two-year process which was due to conclude with the UK\'s exit on 29 March 2019. That deadline has since been extended to 31 October 2019.']}}]}]