administr commiss european commun social secur migrant workersannu averag cost benefit kind applic articl council regul eec flat rate assess expenditur respect benefit kind dispens rel refer articl council regul eec made averag cost shown belgium emploi personsbf emploi personsbf franceemploi personsff emploi personsff ii applic articl council regul eec flat rate assess expenditur respect benefit kind dispens pursuant articl council regul eec made averag cost shown belgiumemploi personsbf emploi personsbf franceemploi personsff emploi personsff averag cost luxembourg netherland oj averag cost germani ireland unit kingdom oj