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The 21.5 million current and former federal employees impacted by the massive data breach in 2015 may never know if they will be targeted based on the information stolen from the Office of Personnel Management .
 21.5 million: number of victim; 2015: time; federal employees: victim
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: data breach 
  Option: victim, attacker, attack pattern, purpose, damage amount, tool, time, place, number of victim, compromised data, number of data 
Text: {0} 
Answer:
 21.5 million: number of victim; 2015: time; federal employees: victim