CREATE TABLE table_49437 ("Borough" TEXT, "1970" FLOAT, "1980" FLOAT, "1990" FLOAT, "2000" FLOAT, "2006" FLOAT)

What was the percentage in 2006 that had less than 9% in 1970?
SELECT AVG("2006") FROM table_49437 WHERE "1970" < '9'
SELECT AVG("2006") FROM "table_49437" WHERE "1970" < '9'