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The average amount of a ransomware demand has increased from $ 294 in 2015 to $ 1,077 last year , according to a report released last week by Symantec .
 $ 294: price; 2015: time; last year: time; $ 1,077: 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:
 $ 294: price; 2015: time; last year: time; $ 1,077: price