CREATE TABLE table_name_12 (country VARCHAR2, debt_as__percentage_of_value VARCHAR2, _percentage_change_on_year VARCHAR2)

Name the country where % change on year is 21 and value is less than 86
SELECT country FROM table_name_12 WHERE debt_as__percentage_of_value < 86 AND _percentage_change_on_year = "21"
SELECT "country" FROM "table_name_12" WHERE "21" = "_percentage_change_on_year" AND "debt_as__percentage_of_value" < 86