CREATE TABLE table_52221 ("County" TEXT, "1900" FLOAT, "1930" FLOAT, "1950" FLOAT, "2000" FLOAT, "2006 est." FLOAT)

What is the 1930 population when the 2006 est. is less than 44,726 in the county of frio?
SELECT SUM("1930") FROM table_52221 WHERE "2006 est." < '44,726' AND "County" = 'frio'
SELECT SUM("1930") FROM "table_52221" WHERE "2006 est." < '44,726' AND "County" = 'frio'