instruction:
In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
question:
Context: Greater success was earned with Dean Martin's recording of "Sway", which reached #6 on the UK Singles Chart, Link Information: Record charts in the UK began in 1952, when Percy Dickins of the New Musical Express (NME) gathered a pool of 52 stores willing to report sales figures. Answer: 1952
answer:
In what year was the singles chart in which "Sway" reached #6 first begun?


question:
Context: He moved back to his homeland and graduated first at the Annenschule Link Information: none Answer: none
answer:
In what year did Mikhail Sumarokov-Elston graduate from Annenschule?


question:
Context: The Latin Empire was aided by other Crusader states established on Byzantine territory after the Fourth Crusade Link Information: when a number of primarily French and Italian Crusader states were  Answer: French 
answer:

Which states aided the Latin Empire under the benner "Crusader States"?