Funso (Chichewa): Kodi Nkhata Bay inalemba magawo anthu kuyambira mmodzi owunikidwa  angati?
Question (English): How many non-zero percentage populations are recorded for Nkhata Bay?
Table: food_insecurity (difficulty: easy)
SQL: SELECT COUNT(*) FROM food_insecurity WHERE district = 'Nkhata Bay' AND percentage_population > 0;
Result: [(6,)]