Question: when did 4th generation intel processors come out
[{'answer': 'June 4 , 2013', 'provenance': [{'wikipedia_id': '18782613', 'title': 'Haswell (microarchitecture)', 'start_paragraph_id': 1, 'start_character': 223, 'end_paragraph_id': 1, 'end_character': 236, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18782613', 'title': 'Haswell (microarchitecture)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 505, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9477777608802216311}, 'section': 'Section::::Abstract.'}]}]