Question: when were the beatles inducted into the rock and roll hall of fame
[{'answer': '1988'}, {'provenance': [{'wikipedia_id': '29812', 'title': 'The Beatles', 'section': 'Section::::Abstract.', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['McCartney and Starr are still musically active. The Beatles are the best-selling band in history, with estimated sales of over 800 million albums worldwide.', 'The group were inducted into the Rock and Roll Hall of Fame in 1988, and all four main members were inducted individually between 1994 and 2015.', '1988']}}]}, {'provenance': [{'wikipedia_id': '29812', 'title': 'The Beatles', 'section': 'Section::::Discography.\n', 'start_paragraph_id': 158, 'end_paragraph_id': 158, 'meta': {'evidence_span': ['they received the Grammy Lifetime Achievement Award. On 16 January, beginning from 2001, people celebrate the World Beatles Day under UNESCO. This date has direct relation to the opening of The Cavern Club in 1957. Principal members Early members Touring musician The above albums were reissued on CD in 1987, followed by the 1988 compilations "Past Masters Volume One" and "Past Masters Volume Two", which collected all of the Beatles\'', '1988']}}]}]