2006년까지는 생산직과 사무직으로 노동력을 분류했던 반면 2007년부터는 상용 근로자와 임시 및 일용 근로자로 구분한다.
Until 2006, the labor force was classified into production and white-collar workers, whereas from 2007, they were divided into regular workers and temporary and daily workers.