The 1983 season had a cumulative ACE of 16.86 ( 17 ) , which is extremely below normal and currently the least active season on record since 1914 , which had an ACE rating of 2.53 . The 1983 season had a cumulative ACE of 16.86 ( 17 ) , which is well below normal and currently the least active season on record since the 1914 season , which had an ACE rating of 2.53 .