CREATE TABLE table_name_12 (country VARCHAR(255), debt_as__percentage_of_value VARCHAR(255), _percentage_change_on_year VARCHAR(255))
Name the country where % change on year is 21 and value is less than 86
    
SQL: SELECT country FROM table_name_12 WHERE debt_as__percentage_of_value < 86 AND _percentage_change_on_year = "21"