1523
Under David Cameron house building is at its lowest peacetime level since 1920 's . Labour would have 200 , 000 houses built each year by 2020 .
 person: David Cameron; organization: Labour
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:
 person: David Cameron; organization: Labour