CREATE TABLE table_49439 ("Borough" TEXT, "1970" FLOAT, "1980" FLOAT, "1990" FLOAT, "2000" FLOAT, "2006" FLOAT)

What was the percentage in 1980 in Brooklyn?
SELECT MIN("1980") FROM table_49439 WHERE "Borough" = 'brooklyn'
SELECT MIN("1980") FROM "table_49439" WHERE "Borough" = 'brooklyn'