Records held on the Garda National Immigration Bureau Information System, which is the statutory register for non-nationals residing in the State, indicate that a total of 17,303 persons between the ages of 16 and 24 are currently registered in the State. Records on the system do not indicate which of these persons are the children of migrant workers. To seek to obtain the information on the numbers who are children of migrant workers would require a disproportionate use of time and resources, and could not be done without having An Garda Síochána engage in an extensive trawl of records which could be carried out only at the expense of other important work.