1815
The native swans have benefited from removal of non-native mute swans by the Michigan Department of Natural Resources beginning in the 1960 s , with a decline from 15,000 mute swans in 2010 to 8,700 in 2015 .
 organization: Michigan Department of Natural Resources
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:
 organization: Michigan Department of Natural Resources