8352
The net balance on passenger transportation deteriorated from a net deficit of US$ 1.3 billion in 1985 to a net deficit of US$ 3.7 billion by 1988 , and travel ( purchases of goods and services by individuals while abroad ) increased from US$ 3.7 billion to US$ 15.8 billion over the same short time .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None