SQL & PL/SQL

I have created this statement level trigger but it executes like row level trigger...

CREATE OR REPLACE TRIGGER trg_citizens_log
AFTER INSERT ON citizens
BEGIN
   INSERT INTO trigger_log ( log_id,trigger_name, log_time)
                   VALUES ( trigger_log_SEQ.nextval,'STATEMENT_TRIGGER', SYSTIMESTAMP );
END;
/

I have checked with these insert script..

BEGIN
  INSERT INTO CITIZENS VALUES (2, 'JOSH', 'MARK', 40);
  INSERT INTO CITIZENS VALUES (3, 'MANI', 'RAJ', 38);
  INSERT INTO CITIZENS VALUES (4, 'VIGNESH', 'KUMAR', 34);       
END;
/

INSERT ALL
  INTO CITIZENS VALUES (2, 'JOSH', 'MARK', 40)
  INTO CITIZENS VALUES (3, 'MANI', 'RAJ', 38)
  INTO CITIZENS VALUES (4, 'VIGNESH', 'KUMAR', 34)
SELECT * FROM dual;

Can anyone explain me why its behaving like this?