1467
By contrast , the federal prison population increased significantly under presidents Ronald Reagan , George H. W. Bush , Bill Clinton , and George W. Bush .
 person: Ronald Reagan; person: George H. W. Bush; person: Bill Clinton; person: George W. Bush
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Ronald Reagan; person: George H. W. Bush; person: Bill Clinton; person: George W. Bush