66439
This has included the United Kingdom ( 1968 ) , Canada ( early 2000 s ) , the United States ( 2016 ) and Finland ( 2017 ) .
 United Kingdom, Canada, United States, Finland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 United Kingdom, Canada, United States, Finland