3513
Within Yellowstone National Park , injuries caused by grizzly attacks in developed areas averaged approximately one per year during the 1930 s through to the 1950 s , though it increased to four per year during the 1960 s .
 location: Yellowstone National Park
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:
 location: Yellowstone National Park