Table schema:
CREATE TABLE table_15977768_1 (centennial VARCHAR, akimel_a_al_the_name_is_tohono_oodham_for_children_of_the_river VARCHAR)

Question: Name the centennial for 1992 akimel
SQL: SELECT centennial FROM table_15977768_1 WHERE akimel_a_al_the_name_is_tohono_oodham_for_children_of_the_river = "1992"