Question: Name the centennial for 1992 akimel
Schema: create table table_15977768_1 (centennial varchar, akimel_a_al_the_name_is_tohono_oodham_for_children_of_the_river varchar, PRIMARY KEY (centennial))
SQL: select centennial from table_15977768_1 where akimel_a_al_the_name_is_tohono_oodham_for_children_of_the_river = "1992"