Question: when has the united states hosted the olympics
[{'answer': '1904'}, {'answer': '1932'}, {'answer': '1960', 'provenance': [{'wikipedia_id': '2112059', 'title': 'United States at the Olympics', 'start_paragraph_id': 27, 'start_character': 518, 'end_paragraph_id': 27, 'end_character': 522, 'bleu_score': 1.0, 'section': 'Section::::Russia–United States rivalry.:Basketball.\n'}]}, {'answer': '1980', 'provenance': [{'wikipedia_id': '2112059', 'title': 'United States at the Olympics', 'start_paragraph_id': 1, 'start_character': 122, 'end_paragraph_id': 1, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1984', 'provenance': [{'wikipedia_id': '2112059', 'title': 'United States at the Olympics', 'start_paragraph_id': 22, 'start_character': 39, 'end_paragraph_id': 22, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Russia–United States rivalry.:Summer Olympics.\n'}]}, {'answer': '1996', 'provenance': [{'wikipedia_id': '2112059', 'title': 'United States at the Olympics', 'start_paragraph_id': 40, 'start_character': 73, 'end_paragraph_id': 40, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Russia–United States rivalry.:Ice hockey.\n'}]}, {'answer': '2002', 'provenance': [{'wikipedia_id': '2112059', 'title': 'United States at the Olympics', 'start_paragraph_id': 41, 'start_character': 89, 'end_paragraph_id': 41, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Russia–United States rivalry.:Ice hockey.\n'}]}]