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Ransomware demands have risen rapidly over the past year , tripling in price from 2015 to 2016 .
 Ransomware: tool; from 2015 to 2016: time
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:
 Ransomware: tool; from 2015 to 2016: time