question: How many years did Willie Mays hit less than 20 home runs from his rookie year in 1951 to retirement in 1973?
answerText: Four: 1969, 1971-1973 (he was drafted and served in the Army 1952-3).
questionEntity.name: Q561852
questionEntity.entityType: entity
questionEntity.label: Willie Mays
questionEntity.mention: Willie Mays
questionEntity.name: 20
questionEntity.entityType: cardinal
questionEntity.mention: 20
questionEntity.name: 1951
questionEntity.entityType: date
questionEntity.mention: 1951
questionEntity.name: 1973
questionEntity.entityType: date
questionEntity.mention: 1973
answerEntity.name: Q9212
answerEntity.label: United States Army