CREATE TABLE table_53639 ("City" TEXT, "1970" FLOAT, "1980" FLOAT, "1990" FLOAT, "2000" FLOAT, "2010 est." FLOAT)

How many 1990 growth numbers had less than 10,522 in 1970?
SELECT COUNT("1990") FROM table_53639 WHERE "1970" < '10,522'
SELECT COUNT("1990") FROM "table_53639" WHERE "1970" < '10,522'