276800
From a small surplus of US$ 900 million in 1978 , the balance on investment income ( earnings from abroad minus the earnings of foreigners in Japan ) grew to US$ 21 billion by 1988 .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None