Datapoint Cape Verdean Creole of Santiago/Proportion of native speakers

On Santiago Island almost all speakers of Cape Verdean Creole of Santiago speak it as a mother tongue except for some immigrants from other islands. Abroad, some descendants of immigrants from Santiago, whose first language is no longer Cape Verdean Creole of Santiago, speak it as a second language and have no full command of it. In Boston (USA), some of them attend language training at the Boston Capverdian Institute.