CREATE TABLE table_204_938 (id DECIMAL, "year" DECIMAL, "edmonton\ hundred" DECIMAL, "elthorne\ hundred" DECIMAL, "gore\ hundred" DECIMAL, "isleworth\ hundred" DECIMAL, "ossulstone\ hundred\ holborn\ division" DECIMAL, "ossulstone\ hundred\ finsbury\ division" DECIMAL, "ossulstone\ hundred\ kensington\ division" DECIMAL, "ossulstone\ hundred\ tower\ division" DECIMAL, "spelthorne\ hundred" DECIMAL, "london city\ within\ the walls" DECIMAL, "london city\ without\ the walls" DECIMAL, "inns of court\ and\ chancery" DECIMAL, "westminster\ city and\ liberty" DECIMAL, "total" DECIMAL)

in 1821 , the population of middlesex in the kensington division was 70,808 . what was it ten years earlier , at the time of the previous census ?
SELECT "ossulstone\nhundred\nkensington\ndivision" FROM table_204_938 WHERE "year" = 1821 - 10
SELECT "ossulstone\nhundred\nkensington\ndivision" FROM "table_204_938" WHERE "year" = 1811