These Dutch Indos mainly entered the United States under legislative refugee measures and were sponsored by Christian organizations such as the Church World Service and the Catholic Relief Services. An accurate count of Indo immigrants is not available, as the U.S. Census classified people according to their self-determined ethnic affiliation. The Indos could have therefore been included in overlapping categories of "country of origin", "other Asians," "total foreign", "mixed parentage", "total foreign-born" and "foreign mother tongue". However the Indos that settled in the United States via the legislative refugee measures number at least 25,000 people.