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A study by researchers at Google , Chainalysis , University of California San Diego and NYU Tandon School of Engineering estimated that from 2016 to mid 2017 , victims paid $ 25 million in ransom to get files back .
 from 2016 to mid 2017: time; victims: victim; $ 25 million: price
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 from 2016 to mid 2017: time; victims: victim; $ 25 million: price