1520
In 1991 the percentage of Comorians residing in cities and towns of more than 5,000 persons was about 30 percent , up from 25 percent in 1985 and 23 percent in 1980 .
 None
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